#### 2.228   ODE No. 228

$(4 y(x)+11 x-11) y'(x)-25 y(x)-8 x+62=0$ Mathematica : cpu = 0.250611 (sec), leaf count = 3357

$\left \{\left \{y(x)\to \frac {1}{4 \left (-\frac {\sqrt [3]{2} \left (59049 \cosh \left (\frac {3 c_1}{8}\right ) x^2+59049 \sinh \left (\frac {3 c_1}{8}\right ) x^2-13122 \cosh \left (\frac {3 c_1}{8}\right ) x-13122 \sinh \left (\frac {3 c_1}{8}\right ) x+729 \cosh \left (\frac {3 c_1}{8}\right )+729 \sinh \left (\frac {3 c_1}{8}\right )-729\right )}{81 (9 x-1) \left (81 \cosh \left (\frac {3 c_1}{8}\right ) x^2+81 \sinh \left (\frac {3 c_1}{8}\right ) x^2-18 \cosh \left (\frac {3 c_1}{8}\right ) x-18 \sinh \left (\frac {3 c_1}{8}\right ) x+\cosh \left (\frac {3 c_1}{8}\right )+\sinh \left (\frac {3 c_1}{8}\right )-1\right ) \sqrt [3]{-258280326 \cosh \left (\frac {3 c_1}{4}\right ) x^4-258280326 \sinh \left (\frac {3 c_1}{4}\right ) x^4+114791256 \cosh \left (\frac {3 c_1}{4}\right ) x^3+114791256 \sinh \left (\frac {3 c_1}{4}\right ) x^3+6377292 \cosh \left (\frac {3 c_1}{8}\right ) x^2-19131876 \cosh \left (\frac {3 c_1}{4}\right ) x^2+6377292 \sinh \left (\frac {3 c_1}{8}\right ) x^2-19131876 \sinh \left (\frac {3 c_1}{4}\right ) x^2-1417176 \cosh \left (\frac {3 c_1}{8}\right ) x+1417176 \cosh \left (\frac {3 c_1}{4}\right ) x-1417176 \sinh \left (\frac {3 c_1}{8}\right ) x+1417176 \sinh \left (\frac {3 c_1}{4}\right ) x+78732 \cosh \left (\frac {3 c_1}{8}\right )-39366 \cosh \left (\frac {3 c_1}{4}\right )+78732 \sinh \left (\frac {3 c_1}{8}\right )-39366 \sinh \left (\frac {3 c_1}{4}\right )+\sqrt {4 \left (59049 \cosh \left (\frac {3 c_1}{8}\right ) x^2+59049 \sinh \left (\frac {3 c_1}{8}\right ) x^2-13122 \cosh \left (\frac {3 c_1}{8}\right ) x-13122 \sinh \left (\frac {3 c_1}{8}\right ) x+729 \cosh \left (\frac {3 c_1}{8}\right )+729 \sinh \left (\frac {3 c_1}{8}\right )-729\right ){}^3+\left (-258280326 \cosh \left (\frac {3 c_1}{4}\right ) x^4-258280326 \sinh \left (\frac {3 c_1}{4}\right ) x^4+114791256 \cosh \left (\frac {3 c_1}{4}\right ) x^3+114791256 \sinh \left (\frac {3 c_1}{4}\right ) x^3+6377292 \cosh \left (\frac {3 c_1}{8}\right ) x^2-19131876 \cosh \left (\frac {3 c_1}{4}\right ) x^2+6377292 \sinh \left (\frac {3 c_1}{8}\right ) x^2-19131876 \sinh \left (\frac {3 c_1}{4}\right ) x^2-1417176 \cosh \left (\frac {3 c_1}{8}\right ) x+1417176 \cosh \left (\frac {3 c_1}{4}\right ) x-1417176 \sinh \left (\frac {3 c_1}{8}\right ) x+1417176 \sinh \left (\frac {3 c_1}{4}\right ) x+78732 \cosh \left (\frac {3 c_1}{8}\right )-39366 \cosh \left (\frac {3 c_1}{4}\right )+78732 \sinh \left (\frac {3 c_1}{8}\right )-39366 \sinh \left (\frac {3 c_1}{4}\right )-39366\right ){}^2}-39366}}+\frac {\sqrt [3]{-258280326 \cosh \left (\frac {3 c_1}{4}\right ) x^4-258280326 \sinh \left (\frac {3 c_1}{4}\right ) x^4+114791256 \cosh \left (\frac {3 c_1}{4}\right ) x^3+114791256 \sinh \left (\frac {3 c_1}{4}\right ) x^3+6377292 \cosh \left (\frac {3 c_1}{8}\right ) x^2-19131876 \cosh \left (\frac {3 c_1}{4}\right ) x^2+6377292 \sinh \left (\frac {3 c_1}{8}\right ) x^2-19131876 \sinh \left (\frac {3 c_1}{4}\right ) x^2-1417176 \cosh \left (\frac {3 c_1}{8}\right ) x+1417176 \cosh \left (\frac {3 c_1}{4}\right ) x-1417176 \sinh \left (\frac {3 c_1}{8}\right ) x+1417176 \sinh \left (\frac {3 c_1}{4}\right ) x+78732 \cosh \left (\frac {3 c_1}{8}\right )-39366 \cosh \left (\frac {3 c_1}{4}\right )+78732 \sinh \left (\frac {3 c_1}{8}\right )-39366 \sinh \left (\frac {3 c_1}{4}\right )+\sqrt {4 \left (59049 \cosh \left (\frac {3 c_1}{8}\right ) x^2+59049 \sinh \left (\frac {3 c_1}{8}\right ) x^2-13122 \cosh \left (\frac {3 c_1}{8}\right ) x-13122 \sinh \left (\frac {3 c_1}{8}\right ) x+729 \cosh \left (\frac {3 c_1}{8}\right )+729 \sinh \left (\frac {3 c_1}{8}\right )-729\right ){}^3+\left (-258280326 \cosh \left (\frac {3 c_1}{4}\right ) x^4-258280326 \sinh \left (\frac {3 c_1}{4}\right ) x^4+114791256 \cosh \left (\frac {3 c_1}{4}\right ) x^3+114791256 \sinh \left (\frac {3 c_1}{4}\right ) x^3+6377292 \cosh \left (\frac {3 c_1}{8}\right ) x^2-19131876 \cosh \left (\frac {3 c_1}{4}\right ) x^2+6377292 \sinh \left (\frac {3 c_1}{8}\right ) x^2-19131876 \sinh \left (\frac {3 c_1}{4}\right ) x^2-1417176 \cosh \left (\frac {3 c_1}{8}\right ) x+1417176 \cosh \left (\frac {3 c_1}{4}\right ) x-1417176 \sinh \left (\frac {3 c_1}{8}\right ) x+1417176 \sinh \left (\frac {3 c_1}{4}\right ) x+78732 \cosh \left (\frac {3 c_1}{8}\right )-39366 \cosh \left (\frac {3 c_1}{4}\right )+78732 \sinh \left (\frac {3 c_1}{8}\right )-39366 \sinh \left (\frac {3 c_1}{4}\right )-39366\right ){}^2}-39366}}{81 \sqrt [3]{2} (9 x-1) \left (81 \cosh \left (\frac {3 c_1}{8}\right ) x^2+81 \sinh \left (\frac {3 c_1}{8}\right ) x^2-18 \cosh \left (\frac {3 c_1}{8}\right ) x-18 \sinh \left (\frac {3 c_1}{8}\right ) x+\cosh \left (\frac {3 c_1}{8}\right )+\sinh \left (\frac {3 c_1}{8}\right )-1\right )}+\frac {1}{3 (9 x-1)}\right )}-\frac {11 (x-1)}{4}\right \},\left \{y(x)\to \frac {1}{4 \left (\frac {\left (1+i \sqrt {3}\right ) \left (59049 \cosh \left (\frac {3 c_1}{8}\right ) x^2+59049 \sinh \left (\frac {3 c_1}{8}\right ) x^2-13122 \cosh \left (\frac {3 c_1}{8}\right ) x-13122 \sinh \left (\frac {3 c_1}{8}\right ) x+729 \cosh \left (\frac {3 c_1}{8}\right )+729 \sinh \left (\frac {3 c_1}{8}\right )-729\right )}{81\ 2^{2/3} (9 x-1) \left (81 \cosh \left (\frac {3 c_1}{8}\right ) x^2+81 \sinh \left (\frac {3 c_1}{8}\right ) x^2-18 \cosh \left (\frac {3 c_1}{8}\right ) x-18 \sinh \left (\frac {3 c_1}{8}\right ) x+\cosh \left (\frac {3 c_1}{8}\right )+\sinh \left (\frac {3 c_1}{8}\right )-1\right ) \sqrt [3]{-258280326 \cosh \left (\frac {3 c_1}{4}\right ) x^4-258280326 \sinh \left (\frac {3 c_1}{4}\right ) x^4+114791256 \cosh \left (\frac {3 c_1}{4}\right ) x^3+114791256 \sinh \left (\frac {3 c_1}{4}\right ) x^3+6377292 \cosh \left (\frac {3 c_1}{8}\right ) x^2-19131876 \cosh \left (\frac {3 c_1}{4}\right ) x^2+6377292 \sinh \left (\frac {3 c_1}{8}\right ) x^2-19131876 \sinh \left (\frac {3 c_1}{4}\right ) x^2-1417176 \cosh \left (\frac {3 c_1}{8}\right ) x+1417176 \cosh \left (\frac {3 c_1}{4}\right ) x-1417176 \sinh \left (\frac {3 c_1}{8}\right ) x+1417176 \sinh \left (\frac {3 c_1}{4}\right ) x+78732 \cosh \left (\frac {3 c_1}{8}\right )-39366 \cosh \left (\frac {3 c_1}{4}\right )+78732 \sinh \left (\frac {3 c_1}{8}\right )-39366 \sinh \left (\frac {3 c_1}{4}\right )+\sqrt {4 \left (59049 \cosh \left (\frac {3 c_1}{8}\right ) x^2+59049 \sinh \left (\frac {3 c_1}{8}\right ) x^2-13122 \cosh \left (\frac {3 c_1}{8}\right ) x-13122 \sinh \left (\frac {3 c_1}{8}\right ) x+729 \cosh \left (\frac {3 c_1}{8}\right )+729 \sinh \left (\frac {3 c_1}{8}\right )-729\right ){}^3+\left (-258280326 \cosh \left (\frac {3 c_1}{4}\right ) x^4-258280326 \sinh \left (\frac {3 c_1}{4}\right ) x^4+114791256 \cosh \left (\frac {3 c_1}{4}\right ) x^3+114791256 \sinh \left (\frac {3 c_1}{4}\right ) x^3+6377292 \cosh \left (\frac {3 c_1}{8}\right ) x^2-19131876 \cosh \left (\frac {3 c_1}{4}\right ) x^2+6377292 \sinh \left (\frac {3 c_1}{8}\right ) x^2-19131876 \sinh \left (\frac {3 c_1}{4}\right ) x^2-1417176 \cosh \left (\frac {3 c_1}{8}\right ) x+1417176 \cosh \left (\frac {3 c_1}{4}\right ) x-1417176 \sinh \left (\frac {3 c_1}{8}\right ) x+1417176 \sinh \left (\frac {3 c_1}{4}\right ) x+78732 \cosh \left (\frac {3 c_1}{8}\right )-39366 \cosh \left (\frac {3 c_1}{4}\right )+78732 \sinh \left (\frac {3 c_1}{8}\right )-39366 \sinh \left (\frac {3 c_1}{4}\right )-39366\right ){}^2}-39366}}-\frac {\left (1-i \sqrt {3}\right ) \sqrt [3]{-258280326 \cosh \left (\frac {3 c_1}{4}\right ) x^4-258280326 \sinh \left (\frac {3 c_1}{4}\right ) x^4+114791256 \cosh \left (\frac {3 c_1}{4}\right ) x^3+114791256 \sinh \left (\frac {3 c_1}{4}\right ) x^3+6377292 \cosh \left (\frac {3 c_1}{8}\right ) x^2-19131876 \cosh \left (\frac {3 c_1}{4}\right ) x^2+6377292 \sinh \left (\frac {3 c_1}{8}\right ) x^2-19131876 \sinh \left (\frac {3 c_1}{4}\right ) x^2-1417176 \cosh \left (\frac {3 c_1}{8}\right ) x+1417176 \cosh \left (\frac {3 c_1}{4}\right ) x-1417176 \sinh \left (\frac {3 c_1}{8}\right ) x+1417176 \sinh \left (\frac {3 c_1}{4}\right ) x+78732 \cosh \left (\frac {3 c_1}{8}\right )-39366 \cosh \left (\frac {3 c_1}{4}\right )+78732 \sinh \left (\frac {3 c_1}{8}\right )-39366 \sinh \left (\frac {3 c_1}{4}\right )+\sqrt {4 \left (59049 \cosh \left (\frac {3 c_1}{8}\right ) x^2+59049 \sinh \left (\frac {3 c_1}{8}\right ) x^2-13122 \cosh \left (\frac {3 c_1}{8}\right ) x-13122 \sinh \left (\frac {3 c_1}{8}\right ) x+729 \cosh \left (\frac {3 c_1}{8}\right )+729 \sinh \left (\frac {3 c_1}{8}\right )-729\right ){}^3+\left (-258280326 \cosh \left (\frac {3 c_1}{4}\right ) x^4-258280326 \sinh \left (\frac {3 c_1}{4}\right ) x^4+114791256 \cosh \left (\frac {3 c_1}{4}\right ) x^3+114791256 \sinh \left (\frac {3 c_1}{4}\right ) x^3+6377292 \cosh \left (\frac {3 c_1}{8}\right ) x^2-19131876 \cosh \left (\frac {3 c_1}{4}\right ) x^2+6377292 \sinh \left (\frac {3 c_1}{8}\right ) x^2-19131876 \sinh \left (\frac {3 c_1}{4}\right ) x^2-1417176 \cosh \left (\frac {3 c_1}{8}\right ) x+1417176 \cosh \left (\frac {3 c_1}{4}\right ) x-1417176 \sinh \left (\frac {3 c_1}{8}\right ) x+1417176 \sinh \left (\frac {3 c_1}{4}\right ) x+78732 \cosh \left (\frac {3 c_1}{8}\right )-39366 \cosh \left (\frac {3 c_1}{4}\right )+78732 \sinh \left (\frac {3 c_1}{8}\right )-39366 \sinh \left (\frac {3 c_1}{4}\right )-39366\right ){}^2}-39366}}{162 \sqrt [3]{2} (9 x-1) \left (81 \cosh \left (\frac {3 c_1}{8}\right ) x^2+81 \sinh \left (\frac {3 c_1}{8}\right ) x^2-18 \cosh \left (\frac {3 c_1}{8}\right ) x-18 \sinh \left (\frac {3 c_1}{8}\right ) x+\cosh \left (\frac {3 c_1}{8}\right )+\sinh \left (\frac {3 c_1}{8}\right )-1\right )}+\frac {1}{3 (9 x-1)}\right )}-\frac {11 (x-1)}{4}\right \},\left \{y(x)\to \frac {1}{4 \left (\frac {\left (1-i \sqrt {3}\right ) \left (59049 \cosh \left (\frac {3 c_1}{8}\right ) x^2+59049 \sinh \left (\frac {3 c_1}{8}\right ) x^2-13122 \cosh \left (\frac {3 c_1}{8}\right ) x-13122 \sinh \left (\frac {3 c_1}{8}\right ) x+729 \cosh \left (\frac {3 c_1}{8}\right )+729 \sinh \left (\frac {3 c_1}{8}\right )-729\right )}{81\ 2^{2/3} (9 x-1) \left (81 \cosh \left (\frac {3 c_1}{8}\right ) x^2+81 \sinh \left (\frac {3 c_1}{8}\right ) x^2-18 \cosh \left (\frac {3 c_1}{8}\right ) x-18 \sinh \left (\frac {3 c_1}{8}\right ) x+\cosh \left (\frac {3 c_1}{8}\right )+\sinh \left (\frac {3 c_1}{8}\right )-1\right ) \sqrt [3]{-258280326 \cosh \left (\frac {3 c_1}{4}\right ) x^4-258280326 \sinh \left (\frac {3 c_1}{4}\right ) x^4+114791256 \cosh \left (\frac {3 c_1}{4}\right ) x^3+114791256 \sinh \left (\frac {3 c_1}{4}\right ) x^3+6377292 \cosh \left (\frac {3 c_1}{8}\right ) x^2-19131876 \cosh \left (\frac {3 c_1}{4}\right ) x^2+6377292 \sinh \left (\frac {3 c_1}{8}\right ) x^2-19131876 \sinh \left (\frac {3 c_1}{4}\right ) x^2-1417176 \cosh \left (\frac {3 c_1}{8}\right ) x+1417176 \cosh \left (\frac {3 c_1}{4}\right ) x-1417176 \sinh \left (\frac {3 c_1}{8}\right ) x+1417176 \sinh \left (\frac {3 c_1}{4}\right ) x+78732 \cosh \left (\frac {3 c_1}{8}\right )-39366 \cosh \left (\frac {3 c_1}{4}\right )+78732 \sinh \left (\frac {3 c_1}{8}\right )-39366 \sinh \left (\frac {3 c_1}{4}\right )+\sqrt {4 \left (59049 \cosh \left (\frac {3 c_1}{8}\right ) x^2+59049 \sinh \left (\frac {3 c_1}{8}\right ) x^2-13122 \cosh \left (\frac {3 c_1}{8}\right ) x-13122 \sinh \left (\frac {3 c_1}{8}\right ) x+729 \cosh \left (\frac {3 c_1}{8}\right )+729 \sinh \left (\frac {3 c_1}{8}\right )-729\right ){}^3+\left (-258280326 \cosh \left (\frac {3 c_1}{4}\right ) x^4-258280326 \sinh \left (\frac {3 c_1}{4}\right ) x^4+114791256 \cosh \left (\frac {3 c_1}{4}\right ) x^3+114791256 \sinh \left (\frac {3 c_1}{4}\right ) x^3+6377292 \cosh \left (\frac {3 c_1}{8}\right ) x^2-19131876 \cosh \left (\frac {3 c_1}{4}\right ) x^2+6377292 \sinh \left (\frac {3 c_1}{8}\right ) x^2-19131876 \sinh \left (\frac {3 c_1}{4}\right ) x^2-1417176 \cosh \left (\frac {3 c_1}{8}\right ) x+1417176 \cosh \left (\frac {3 c_1}{4}\right ) x-1417176 \sinh \left (\frac {3 c_1}{8}\right ) x+1417176 \sinh \left (\frac {3 c_1}{4}\right ) x+78732 \cosh \left (\frac {3 c_1}{8}\right )-39366 \cosh \left (\frac {3 c_1}{4}\right )+78732 \sinh \left (\frac {3 c_1}{8}\right )-39366 \sinh \left (\frac {3 c_1}{4}\right )-39366\right ){}^2}-39366}}-\frac {\left (1+i \sqrt {3}\right ) \sqrt [3]{-258280326 \cosh \left (\frac {3 c_1}{4}\right ) x^4-258280326 \sinh \left (\frac {3 c_1}{4}\right ) x^4+114791256 \cosh \left (\frac {3 c_1}{4}\right ) x^3+114791256 \sinh \left (\frac {3 c_1}{4}\right ) x^3+6377292 \cosh \left (\frac {3 c_1}{8}\right ) x^2-19131876 \cosh \left (\frac {3 c_1}{4}\right ) x^2+6377292 \sinh \left (\frac {3 c_1}{8}\right ) x^2-19131876 \sinh \left (\frac {3 c_1}{4}\right ) x^2-1417176 \cosh \left (\frac {3 c_1}{8}\right ) x+1417176 \cosh \left (\frac {3 c_1}{4}\right ) x-1417176 \sinh \left (\frac {3 c_1}{8}\right ) x+1417176 \sinh \left (\frac {3 c_1}{4}\right ) x+78732 \cosh \left (\frac {3 c_1}{8}\right )-39366 \cosh \left (\frac {3 c_1}{4}\right )+78732 \sinh \left (\frac {3 c_1}{8}\right )-39366 \sinh \left (\frac {3 c_1}{4}\right )+\sqrt {4 \left (59049 \cosh \left (\frac {3 c_1}{8}\right ) x^2+59049 \sinh \left (\frac {3 c_1}{8}\right ) x^2-13122 \cosh \left (\frac {3 c_1}{8}\right ) x-13122 \sinh \left (\frac {3 c_1}{8}\right ) x+729 \cosh \left (\frac {3 c_1}{8}\right )+729 \sinh \left (\frac {3 c_1}{8}\right )-729\right ){}^3+\left (-258280326 \cosh \left (\frac {3 c_1}{4}\right ) x^4-258280326 \sinh \left (\frac {3 c_1}{4}\right ) x^4+114791256 \cosh \left (\frac {3 c_1}{4}\right ) x^3+114791256 \sinh \left (\frac {3 c_1}{4}\right ) x^3+6377292 \cosh \left (\frac {3 c_1}{8}\right ) x^2-19131876 \cosh \left (\frac {3 c_1}{4}\right ) x^2+6377292 \sinh \left (\frac {3 c_1}{8}\right ) x^2-19131876 \sinh \left (\frac {3 c_1}{4}\right ) x^2-1417176 \cosh \left (\frac {3 c_1}{8}\right ) x+1417176 \cosh \left (\frac {3 c_1}{4}\right ) x-1417176 \sinh \left (\frac {3 c_1}{8}\right ) x+1417176 \sinh \left (\frac {3 c_1}{4}\right ) x+78732 \cosh \left (\frac {3 c_1}{8}\right )-39366 \cosh \left (\frac {3 c_1}{4}\right )+78732 \sinh \left (\frac {3 c_1}{8}\right )-39366 \sinh \left (\frac {3 c_1}{4}\right )-39366\right ){}^2}-39366}}{162 \sqrt [3]{2} (9 x-1) \left (81 \cosh \left (\frac {3 c_1}{8}\right ) x^2+81 \sinh \left (\frac {3 c_1}{8}\right ) x^2-18 \cosh \left (\frac {3 c_1}{8}\right ) x-18 \sinh \left (\frac {3 c_1}{8}\right ) x+\cosh \left (\frac {3 c_1}{8}\right )+\sinh \left (\frac {3 c_1}{8}\right )-1\right )}+\frac {1}{3 (9 x-1)}\right )}-\frac {11 (x-1)}{4}\right \}\right \}$ Maple : cpu = 0.336 (sec), leaf count = 271

$\left \{ y \left ( x \right ) ={1 \left ( \left ( -76\,x+28 \right ) \sqrt [3]{64-8748\, \left ( 9\,x-1 \right ) ^{2}{\it \_C1}+108\,\sqrt {43046721}\sqrt { \left ( x-1/9 \right ) ^{2} \left ( -{\frac {32}{177147}}+ \left ( x-1/9 \right ) ^{2}{\it \_C1} \right ) {\it \_C1}}}+4\, \left ( \left ( i \left ( 64-8748\, \left ( 9\,x-1 \right ) ^{2}{\it \_C1}+108\,\sqrt {43046721}\sqrt { \left ( x-1/9 \right ) ^{2} \left ( -{\frac {32}{177147}}+ \left ( x-1/9 \right ) ^{2}{\it \_C1} \right ) {\it \_C1}} \right ) ^{2/3}-16\,i \right ) \sqrt {3}- \left ( 64-8748\, \left ( 9\,x-1 \right ) ^{2}{\it \_C1}+108\,\sqrt {43046721}\sqrt { \left ( x-1/9 \right ) ^{2} \left ( -{\frac {32}{177147}}+ \left ( x-1/9 \right ) ^{2}{\it \_C1} \right ) {\it \_C1}} \right ) ^{2/3}-16 \right ) \left ( x+1/2 \right ) \right ) \left ( 8\,\sqrt [3]{64-8748\, \left ( 9\,x-1 \right ) ^{2}{\it \_C1}+108\,\sqrt {43046721}\sqrt { \left ( x-1/9 \right ) ^{2} \left ( -{\frac {32}{177147}}+ \left ( x-1/9 \right ) ^{2}{\it \_C1} \right ) {\it \_C1}}}+ \left ( i \left ( 64-8748\, \left ( 9\,x-1 \right ) ^{2}{\it \_C1}+108\,\sqrt {43046721}\sqrt { \left ( x-1/9 \right ) ^{2} \left ( -{\frac {32}{177147}}+ \left ( x-1/9 \right ) ^{2}{\it \_C1} \right ) {\it \_C1}} \right ) ^{{\frac {2}{3}}}-16\,i \right ) \sqrt {3}- \left ( 64-8748\, \left ( 9\,x-1 \right ) ^{2}{\it \_C1}+108\,\sqrt {43046721}\sqrt { \left ( x-1/9 \right ) ^{2} \left ( -{\frac {32}{177147}}+ \left ( x-1/9 \right ) ^{2}{\it \_C1} \right ) {\it \_C1}} \right ) ^{{\frac {2}{3}}}-16 \right ) ^{-1}} \right \}$