3.29 \(\int \frac {x^3}{\log ^2(c x)} \, dx\)

Optimal. Leaf size=24 \[ \frac {4 \text {Ei}(4 \log (c x))}{c^4}-\frac {x^4}{\log (c x)} \]

[Out]

4*Ei(4*ln(c*x))/c^4-x^4/ln(c*x)

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Rubi [A]  time = 0.04, antiderivative size = 24, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 3, integrand size = 10, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.300, Rules used = {2306, 2309, 2178} \[ \frac {4 \text {Ei}(4 \log (c x))}{c^4}-\frac {x^4}{\log (c x)} \]

Antiderivative was successfully verified.

[In]

Int[x^3/Log[c*x]^2,x]

[Out]

(4*ExpIntegralEi[4*Log[c*x]])/c^4 - x^4/Log[c*x]

Rule 2178

Int[(F_)^((g_.)*((e_.) + (f_.)*(x_)))/((c_.) + (d_.)*(x_)), x_Symbol] :> Simp[(F^(g*(e - (c*f)/d))*ExpIntegral
Ei[(f*g*(c + d*x)*Log[F])/d])/d, x] /; FreeQ[{F, c, d, e, f, g}, x] &&  !$UseGamma === True

Rule 2306

Int[((a_.) + Log[(c_.)*(x_)^(n_.)]*(b_.))^(p_)*((d_.)*(x_))^(m_.), x_Symbol] :> Simp[((d*x)^(m + 1)*(a + b*Log
[c*x^n])^(p + 1))/(b*d*n*(p + 1)), x] - Dist[(m + 1)/(b*n*(p + 1)), Int[(d*x)^m*(a + b*Log[c*x^n])^(p + 1), x]
, x] /; FreeQ[{a, b, c, d, m, n}, x] && NeQ[m, -1] && LtQ[p, -1]

Rule 2309

Int[((a_.) + Log[(c_.)*(x_)]*(b_.))^(p_)*(x_)^(m_.), x_Symbol] :> Dist[1/c^(m + 1), Subst[Int[E^((m + 1)*x)*(a
+ b*x)^p, x], x, Log[c*x]], x] /; FreeQ[{a, b, c, p}, x] && IntegerQ[m]

Rubi steps

\begin {align*} \int \frac {x^3}{\log ^2(c x)} \, dx &=-\frac {x^4}{\log (c x)}+4 \int \frac {x^3}{\log (c x)} \, dx\\ &=-\frac {x^4}{\log (c x)}+\frac {4 \operatorname {Subst}\left (\int \frac {e^{4 x}}{x} \, dx,x,\log (c x)\right )}{c^4}\\ &=\frac {4 \text {Ei}(4 \log (c x))}{c^4}-\frac {x^4}{\log (c x)}\\ \end {align*}

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Mathematica [A]  time = 0.02, size = 24, normalized size = 1.00 \[ \frac {4 \text {Ei}(4 \log (c x))}{c^4}-\frac {x^4}{\log (c x)} \]

Antiderivative was successfully verified.

[In]

Integrate[x^3/Log[c*x]^2,x]

[Out]

(4*ExpIntegralEi[4*Log[c*x]])/c^4 - x^4/Log[c*x]

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fricas [A]  time = 0.42, size = 33, normalized size = 1.38 \[ -\frac {c^{4} x^{4} - 4 \, \log \left (c x\right ) \operatorname {log\_integral}\left (c^{4} x^{4}\right )}{c^{4} \log \left (c x\right )} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x^3/log(c*x)^2,x, algorithm="fricas")

[Out]

-(c^4*x^4 - 4*log(c*x)*log_integral(c^4*x^4))/(c^4*log(c*x))

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giac [A]  time = 0.19, size = 24, normalized size = 1.00 \[ -\frac {x^{4}}{\log \left (c x\right )} + \frac {4 \, {\rm Ei}\left (4 \, \log \left (c x\right )\right )}{c^{4}} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x^3/log(c*x)^2,x, algorithm="giac")

[Out]

-x^4/log(c*x) + 4*Ei(4*log(c*x))/c^4

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maple [A]  time = 0.03, size = 26, normalized size = 1.08 \[ -\frac {x^{4}}{\ln \left (c x \right )}-\frac {4 \Ei \left (1, -4 \ln \left (c x \right )\right )}{c^{4}} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(x^3/ln(c*x)^2,x)

[Out]

-x^4/ln(c*x)-4/c^4*Ei(1,-4*ln(c*x))

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maxima [A]  time = 0.77, size = 13, normalized size = 0.54 \[ \frac {4 \, \Gamma \left (-1, -4 \, \log \left (c x\right )\right )}{c^{4}} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x^3/log(c*x)^2,x, algorithm="maxima")

[Out]

4*gamma(-1, -4*log(c*x))/c^4

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mupad [F]  time = 0.00, size = -1, normalized size = -0.04 \[ \int \frac {x^3}{{\ln \left (c\,x\right )}^2} \,d x \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(x^3/log(c*x)^2,x)

[Out]

int(x^3/log(c*x)^2, x)

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sympy [F]  time = 0.00, size = 0, normalized size = 0.00 \[ - \frac {x^{4}}{\log {\left (c x \right )}} + 4 \int \frac {x^{3}}{\log {\left (c x \right )}}\, dx \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x**3/ln(c*x)**2,x)

[Out]

-x**4/log(c*x) + 4*Integral(x**3/log(c*x), x)

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