ODE
\[ y(x) \left (2 y(x)^2+1\right ) y'(x)=x \left (2 x^2+1\right ) \] ODE Classification
[_separable]
Book solution method
Separable ODE, Neither variable missing
Mathematica ✓
cpu = 0.0118461 (sec), leaf count = 151
\[\left \{\left \{y(x)\to -\frac {\sqrt {-\sqrt {8 c_1+4 x^4+4 x^2+1}-1}}{\sqrt {2}}\right \},\left \{y(x)\to \frac {\sqrt {-\sqrt {8 c_1+4 x^4+4 x^2+1}-1}}{\sqrt {2}}\right \},\left \{y(x)\to -\frac {\sqrt {\sqrt {8 c_1+4 x^4+4 x^2+1}-1}}{\sqrt {2}}\right \},\left \{y(x)\to \frac {\sqrt {\sqrt {8 c_1+4 x^4+4 x^2+1}-1}}{\sqrt {2}}\right \}\right \}\]
Maple ✓
cpu = 0.009 (sec), leaf count = 23
\[ \left \{ {x}^{4}- \left ( y \left ( x \right ) \right ) ^{4}+{x}^{2}- \left ( y \left ( x \right ) \right ) ^{2}+{\it \_C1}=0 \right \} \] Mathematica raw input
DSolve[y[x]*(1 + 2*y[x]^2)*y'[x] == x*(1 + 2*x^2),y[x],x]
Mathematica raw output
{{y[x] -> -(Sqrt[-1 - Sqrt[1 + 4*x^2 + 4*x^4 + 8*C[1]]]/Sqrt[2])}, {y[x] -> Sqrt[-1 - Sqrt[1 + 4*x^2 + 4*x^4 + 8*C[1]]]/Sqrt[2]}, {y[x] -> -(Sqrt[-1 + Sqrt[1 + 4*x^2 + 4*x^4 + 8*C[1]]]/Sqrt[2])}, {y[x] -> Sqrt[-1 + Sqrt[1 + 4*x^2 + 4*x^4 + 8*C[1]]]/Sqrt[2]}}
Maple raw input
dsolve(y(x)*(1+2*y(x)^2)*diff(y(x),x) = x*(2*x^2+1), y(x),'implicit')
Maple raw output
x^4-y(x)^4+x^2-y(x)^2+_C1 = 0