### 3.2237 $$\int \frac{x^3}{2+13 x+15 x^2} \, dx$$

Optimal. Leaf size=33 $\frac{x^2}{30}-\frac{13 x}{225}+\frac{8}{189} \log (3 x+2)-\frac{1}{875} \log (5 x+1)$

[Out]

(-13*x)/225 + x^2/30 + (8*Log[2 + 3*x])/189 - Log[1 + 5*x]/875

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Rubi [A]  time = 0.0161926, antiderivative size = 33, normalized size of antiderivative = 1., number of steps used = 5, number of rules used = 3, integrand size = 16, $$\frac{\text{number of rules}}{\text{integrand size}}$$ = 0.188, Rules used = {701, 632, 31} $\frac{x^2}{30}-\frac{13 x}{225}+\frac{8}{189} \log (3 x+2)-\frac{1}{875} \log (5 x+1)$

Antiderivative was successfully veriﬁed.

[In]

Int[x^3/(2 + 13*x + 15*x^2),x]

[Out]

(-13*x)/225 + x^2/30 + (8*Log[2 + 3*x])/189 - Log[1 + 5*x]/875

Rule 701

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

Rule 632

Int[((d_.) + (e_.)*(x_))/((a_) + (b_.)*(x_) + (c_.)*(x_)^2), x_Symbol] :> With[{q = Rt[b^2 - 4*a*c, 2]}, Dist[
(c*d - e*(b/2 - q/2))/q, Int[1/(b/2 - q/2 + c*x), x], x] - Dist[(c*d - e*(b/2 + q/2))/q, Int[1/(b/2 + q/2 + c*
x), 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 31

Int[((a_) + (b_.)*(x_))^(-1), x_Symbol] :> Simp[Log[RemoveContent[a + b*x, x]]/b, x] /; FreeQ[{a, b}, x]

Rubi steps

\begin{align*} \int \frac{x^3}{2+13 x+15 x^2} \, dx &=\int \left (-\frac{13}{225}+\frac{x}{15}+\frac{26+139 x}{225 \left (2+13 x+15 x^2\right )}\right ) \, dx\\ &=-\frac{13 x}{225}+\frac{x^2}{30}+\frac{1}{225} \int \frac{26+139 x}{2+13 x+15 x^2} \, dx\\ &=-\frac{13 x}{225}+\frac{x^2}{30}-\frac{3}{175} \int \frac{1}{3+15 x} \, dx+\frac{40}{63} \int \frac{1}{10+15 x} \, dx\\ &=-\frac{13 x}{225}+\frac{x^2}{30}+\frac{8}{189} \log (2+3 x)-\frac{1}{875} \log (1+5 x)\\ \end{align*}

Mathematica [A]  time = 0.0042784, size = 33, normalized size = 1. $\frac{x^2}{30}-\frac{13 x}{225}+\frac{8}{189} \log (3 x+2)-\frac{1}{875} \log (5 x+1)$

Antiderivative was successfully veriﬁed.

[In]

Integrate[x^3/(2 + 13*x + 15*x^2),x]

[Out]

(-13*x)/225 + x^2/30 + (8*Log[2 + 3*x])/189 - Log[1 + 5*x]/875

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Maple [A]  time = 0.044, size = 26, normalized size = 0.8 \begin{align*} -{\frac{13\,x}{225}}+{\frac{{x}^{2}}{30}}+{\frac{8\,\ln \left ( 2+3\,x \right ) }{189}}-{\frac{\ln \left ( 1+5\,x \right ) }{875}} \end{align*}

Veriﬁcation of antiderivative is not currently implemented for this CAS.

[In]

int(x^3/(15*x^2+13*x+2),x)

[Out]

-13/225*x+1/30*x^2+8/189*ln(2+3*x)-1/875*ln(1+5*x)

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Maxima [A]  time = 0.976913, size = 34, normalized size = 1.03 \begin{align*} \frac{1}{30} \, x^{2} - \frac{13}{225} \, x - \frac{1}{875} \, \log \left (5 \, x + 1\right ) + \frac{8}{189} \, \log \left (3 \, x + 2\right ) \end{align*}

Veriﬁcation of antiderivative is not currently implemented for this CAS.

[In]

integrate(x^3/(15*x^2+13*x+2),x, algorithm="maxima")

[Out]

1/30*x^2 - 13/225*x - 1/875*log(5*x + 1) + 8/189*log(3*x + 2)

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Fricas [A]  time = 2.16127, size = 85, normalized size = 2.58 \begin{align*} \frac{1}{30} \, x^{2} - \frac{13}{225} \, x - \frac{1}{875} \, \log \left (5 \, x + 1\right ) + \frac{8}{189} \, \log \left (3 \, x + 2\right ) \end{align*}

Veriﬁcation of antiderivative is not currently implemented for this CAS.

[In]

integrate(x^3/(15*x^2+13*x+2),x, algorithm="fricas")

[Out]

1/30*x^2 - 13/225*x - 1/875*log(5*x + 1) + 8/189*log(3*x + 2)

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Sympy [A]  time = 0.108456, size = 27, normalized size = 0.82 \begin{align*} \frac{x^{2}}{30} - \frac{13 x}{225} - \frac{\log{\left (x + \frac{1}{5} \right )}}{875} + \frac{8 \log{\left (x + \frac{2}{3} \right )}}{189} \end{align*}

Veriﬁcation of antiderivative is not currently implemented for this CAS.

[In]

integrate(x**3/(15*x**2+13*x+2),x)

[Out]

x**2/30 - 13*x/225 - log(x + 1/5)/875 + 8*log(x + 2/3)/189

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Giac [A]  time = 1.11101, size = 36, normalized size = 1.09 \begin{align*} \frac{1}{30} \, x^{2} - \frac{13}{225} \, x - \frac{1}{875} \, \log \left ({\left | 5 \, x + 1 \right |}\right ) + \frac{8}{189} \, \log \left ({\left | 3 \, x + 2 \right |}\right ) \end{align*}

Veriﬁcation of antiderivative is not currently implemented for this CAS.

[In]

integrate(x^3/(15*x^2+13*x+2),x, algorithm="giac")

[Out]

1/30*x^2 - 13/225*x - 1/875*log(abs(5*x + 1)) + 8/189*log(abs(3*x + 2))