3.115 \(\int \frac{-20+8 x+5 x^3}{(-4+x)^3 (8-4 x+x^2)} \, dx\)

Optimal. Leaf size=58 \[ \frac{45}{32} \log \left (x^2-4 x+8\right )+\frac{41}{4 (4-x)}-\frac{83}{4 (4-x)^2}-\frac{45}{16} \log (4-x)-\frac{3}{16} \tan ^{-1}\left (1-\frac{x}{2}\right ) \]

[Out]

-83/(4*(4 - x)^2) + 41/(4*(4 - x)) - (3*ArcTan[1 - x/2])/16 - (45*Log[4 - x])/16 + (45*Log[8 - 4*x + x^2])/32

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Rubi [A]  time = 0.0550267, antiderivative size = 58, normalized size of antiderivative = 1., number of steps used = 6, number of rules used = 5, integrand size = 26, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.192, Rules used = {1628, 634, 617, 204, 628} \[ \frac{45}{32} \log \left (x^2-4 x+8\right )+\frac{41}{4 (4-x)}-\frac{83}{4 (4-x)^2}-\frac{45}{16} \log (4-x)-\frac{3}{16} \tan ^{-1}\left (1-\frac{x}{2}\right ) \]

Antiderivative was successfully verified.

[In]

Int[(-20 + 8*x + 5*x^3)/((-4 + x)^3*(8 - 4*x + x^2)),x]

[Out]

-83/(4*(4 - x)^2) + 41/(4*(4 - x)) - (3*ArcTan[1 - x/2])/16 - (45*Log[4 - x])/16 + (45*Log[8 - 4*x + x^2])/32

Rule 1628

Int[(Pq_)*((d_.) + (e_.)*(x_))^(m_.)*((a_.) + (b_.)*(x_) + (c_.)*(x_)^2)^(p_.), x_Symbol] :> Int[ExpandIntegra
nd[(d + e*x)^m*Pq*(a + b*x + c*x^2)^p, x], x] /; FreeQ[{a, b, c, d, e, m}, x] && PolyQ[Pq, x] && IGtQ[p, -2]

Rule 634

Int[((d_.) + (e_.)*(x_))/((a_) + (b_.)*(x_) + (c_.)*(x_)^2), x_Symbol] :> Dist[(2*c*d - b*e)/(2*c), Int[1/(a +
b*x + c*x^2), x], x] + Dist[e/(2*c), Int[(b + 2*c*x)/(a + b*x + c*x^2), x], x] /; FreeQ[{a, b, c, d, e}, x] &
& NeQ[2*c*d - b*e, 0] && NeQ[b^2 - 4*a*c, 0] &&  !NiceSqrtQ[b^2 - 4*a*c]

Rule 617

Int[((a_) + (b_.)*(x_) + (c_.)*(x_)^2)^(-1), x_Symbol] :> With[{q = 1 - 4*Simplify[(a*c)/b^2]}, Dist[-2/b, Sub
st[Int[1/(q - x^2), x], x, 1 + (2*c*x)/b], x] /; RationalQ[q] && (EqQ[q^2, 1] ||  !RationalQ[b^2 - 4*a*c])] /;
FreeQ[{a, b, c}, x] && NeQ[b^2 - 4*a*c, 0]

Rule 204

Int[((a_) + (b_.)*(x_)^2)^(-1), x_Symbol] :> -Simp[ArcTan[(Rt[-b, 2]*x)/Rt[-a, 2]]/(Rt[-a, 2]*Rt[-b, 2]), x] /
; FreeQ[{a, b}, x] && PosQ[a/b] && (LtQ[a, 0] || LtQ[b, 0])

Rule 628

Int[((d_) + (e_.)*(x_))/((a_.) + (b_.)*(x_) + (c_.)*(x_)^2), x_Symbol] :> Simp[(d*Log[RemoveContent[a + b*x +
c*x^2, x]])/b, x] /; FreeQ[{a, b, c, d, e}, x] && EqQ[2*c*d - b*e, 0]

Rubi steps

\begin{align*} \int \frac{-20+8 x+5 x^3}{(-4+x)^3 \left (8-4 x+x^2\right )} \, dx &=\int \left (\frac{83}{2 (-4+x)^3}+\frac{41}{4 (-4+x)^2}-\frac{45}{16 (-4+x)}+\frac{3 (-28+15 x)}{16 \left (8-4 x+x^2\right )}\right ) \, dx\\ &=-\frac{83}{4 (4-x)^2}+\frac{41}{4 (4-x)}-\frac{45}{16} \log (4-x)+\frac{3}{16} \int \frac{-28+15 x}{8-4 x+x^2} \, dx\\ &=-\frac{83}{4 (4-x)^2}+\frac{41}{4 (4-x)}-\frac{45}{16} \log (4-x)+\frac{3}{8} \int \frac{1}{8-4 x+x^2} \, dx+\frac{45}{32} \int \frac{-4+2 x}{8-4 x+x^2} \, dx\\ &=-\frac{83}{4 (4-x)^2}+\frac{41}{4 (4-x)}-\frac{45}{16} \log (4-x)+\frac{45}{32} \log \left (8-4 x+x^2\right )+\frac{3}{16} \operatorname{Subst}\left (\int \frac{1}{-1-x^2} \, dx,x,1-\frac{x}{2}\right )\\ &=-\frac{83}{4 (4-x)^2}+\frac{41}{4 (4-x)}-\frac{3}{16} \tan ^{-1}\left (1-\frac{x}{2}\right )-\frac{45}{16} \log (4-x)+\frac{45}{32} \log \left (8-4 x+x^2\right )\\ \end{align*}

Mathematica [A]  time = 0.0244687, size = 46, normalized size = 0.79 \[ \frac{1}{32} \left (45 \log \left (x^2-4 x+8\right )-\frac{328}{x-4}-\frac{664}{(x-4)^2}-90 \log (x-4)+6 \tan ^{-1}\left (\frac{x-2}{2}\right )\right ) \]

Antiderivative was successfully verified.

[In]

Integrate[(-20 + 8*x + 5*x^3)/((-4 + x)^3*(8 - 4*x + x^2)),x]

[Out]

(-664/(-4 + x)^2 - 328/(-4 + x) + 6*ArcTan[(-2 + x)/2] - 90*Log[-4 + x] + 45*Log[8 - 4*x + x^2])/32

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Maple [A]  time = 0.008, size = 41, normalized size = 0.7 \begin{align*} -{\frac{83}{4\, \left ( x-4 \right ) ^{2}}}-{\frac{41}{4\,x-16}}-{\frac{45\,\ln \left ( x-4 \right ) }{16}}+{\frac{45\,\ln \left ({x}^{2}-4\,x+8 \right ) }{32}}+{\frac{3}{16}\arctan \left ( -1+{\frac{x}{2}} \right ) } \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int((5*x^3+8*x-20)/(x-4)^3/(x^2-4*x+8),x)

[Out]

-83/4/(x-4)^2-41/4/(x-4)-45/16*ln(x-4)+45/32*ln(x^2-4*x+8)+3/16*arctan(-1+1/2*x)

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Maxima [A]  time = 1.42162, size = 58, normalized size = 1. \begin{align*} -\frac{41 \, x - 81}{4 \,{\left (x^{2} - 8 \, x + 16\right )}} + \frac{3}{16} \, \arctan \left (\frac{1}{2} \, x - 1\right ) + \frac{45}{32} \, \log \left (x^{2} - 4 \, x + 8\right ) - \frac{45}{16} \, \log \left (x - 4\right ) \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate((5*x^3+8*x-20)/(-4+x)^3/(x^2-4*x+8),x, algorithm="maxima")

[Out]

-1/4*(41*x - 81)/(x^2 - 8*x + 16) + 3/16*arctan(1/2*x - 1) + 45/32*log(x^2 - 4*x + 8) - 45/16*log(x - 4)

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Fricas [A]  time = 2.15851, size = 203, normalized size = 3.5 \begin{align*} \frac{6 \,{\left (x^{2} - 8 \, x + 16\right )} \arctan \left (\frac{1}{2} \, x - 1\right ) + 45 \,{\left (x^{2} - 8 \, x + 16\right )} \log \left (x^{2} - 4 \, x + 8\right ) - 90 \,{\left (x^{2} - 8 \, x + 16\right )} \log \left (x - 4\right ) - 328 \, x + 648}{32 \,{\left (x^{2} - 8 \, x + 16\right )}} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate((5*x^3+8*x-20)/(-4+x)^3/(x^2-4*x+8),x, algorithm="fricas")

[Out]

1/32*(6*(x^2 - 8*x + 16)*arctan(1/2*x - 1) + 45*(x^2 - 8*x + 16)*log(x^2 - 4*x + 8) - 90*(x^2 - 8*x + 16)*log(
x - 4) - 328*x + 648)/(x^2 - 8*x + 16)

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Sympy [A]  time = 0.167134, size = 46, normalized size = 0.79 \begin{align*} - \frac{41 x - 81}{4 x^{2} - 32 x + 64} - \frac{45 \log{\left (x - 4 \right )}}{16} + \frac{45 \log{\left (x^{2} - 4 x + 8 \right )}}{32} + \frac{3 \operatorname{atan}{\left (\frac{x}{2} - 1 \right )}}{16} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate((5*x**3+8*x-20)/(-4+x)**3/(x**2-4*x+8),x)

[Out]

-(41*x - 81)/(4*x**2 - 32*x + 64) - 45*log(x - 4)/16 + 45*log(x**2 - 4*x + 8)/32 + 3*atan(x/2 - 1)/16

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Giac [A]  time = 1.07188, size = 53, normalized size = 0.91 \begin{align*} -\frac{41 \, x - 81}{4 \,{\left (x - 4\right )}^{2}} + \frac{3}{16} \, \arctan \left (\frac{1}{2} \, x - 1\right ) + \frac{45}{32} \, \log \left (x^{2} - 4 \, x + 8\right ) - \frac{45}{16} \, \log \left ({\left | x - 4 \right |}\right ) \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate((5*x^3+8*x-20)/(-4+x)^3/(x^2-4*x+8),x, algorithm="giac")

[Out]

-1/4*(41*x - 81)/(x - 4)^2 + 3/16*arctan(1/2*x - 1) + 45/32*log(x^2 - 4*x + 8) - 45/16*log(abs(x - 4))