3.78 \(\int \frac{\log (-2+e x)}{x} \, dx\)

Optimal. Leaf size=25 \[ \text{PolyLog}\left (2,1-\frac{e x}{2}\right )+\log \left (\frac{e x}{2}\right ) \log (e x-2) \]

[Out]

Log[(e*x)/2]*Log[-2 + e*x] + PolyLog[2, 1 - (e*x)/2]

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Rubi [A]  time = 0.0197499, antiderivative size = 25, normalized size of antiderivative = 1., number of steps used = 2, number of rules used = 2, integrand size = 10, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.2, Rules used = {2394, 2315} \[ \text{PolyLog}\left (2,1-\frac{e x}{2}\right )+\log \left (\frac{e x}{2}\right ) \log (e x-2) \]

Antiderivative was successfully verified.

[In]

Int[Log[-2 + e*x]/x,x]

[Out]

Log[(e*x)/2]*Log[-2 + e*x] + PolyLog[2, 1 - (e*x)/2]

Rule 2394

Int[((a_.) + Log[(c_.)*((d_) + (e_.)*(x_))^(n_.)]*(b_.))/((f_.) + (g_.)*(x_)), x_Symbol] :> Simp[(Log[(e*(f +
g*x))/(e*f - d*g)]*(a + b*Log[c*(d + e*x)^n]))/g, x] - Dist[(b*e*n)/g, Int[Log[(e*(f + g*x))/(e*f - d*g)]/(d +
e*x), x], x] /; FreeQ[{a, b, c, d, e, f, g, n}, x] && NeQ[e*f - d*g, 0]

Rule 2315

Int[Log[(c_.)*(x_)]/((d_) + (e_.)*(x_)), x_Symbol] :> -Simp[PolyLog[2, 1 - c*x]/e, x] /; FreeQ[{c, d, e}, x] &
& EqQ[e + c*d, 0]

Rubi steps

\begin{align*} \int \frac{\log (-2+e x)}{x} \, dx &=\log \left (\frac{e x}{2}\right ) \log (-2+e x)-e \int \frac{\log \left (\frac{e x}{2}\right )}{-2+e x} \, dx\\ &=\log \left (\frac{e x}{2}\right ) \log (-2+e x)+\text{Li}_2\left (1-\frac{e x}{2}\right )\\ \end{align*}

Mathematica [A]  time = 0.0019247, size = 27, normalized size = 1.08 \[ \text{PolyLog}\left (2,\frac{1}{2} (2-e x)\right )+\log \left (\frac{e x}{2}\right ) \log (e x-2) \]

Antiderivative was successfully verified.

[In]

Integrate[Log[-2 + e*x]/x,x]

[Out]

Log[(e*x)/2]*Log[-2 + e*x] + PolyLog[2, (2 - e*x)/2]

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Maple [A]  time = 0.057, size = 19, normalized size = 0.8 \begin{align*}{\it dilog} \left ({\frac{ex}{2}} \right ) +\ln \left ({\frac{ex}{2}} \right ) \ln \left ( ex-2 \right ) \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(ln(e*x-2)/x,x)

[Out]

dilog(1/2*e*x)+ln(1/2*e*x)*ln(e*x-2)

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Maxima [A]  time = 1.2387, size = 27, normalized size = 1.08 \begin{align*} \log \left (e x - 2\right ) \log \left (\frac{1}{2} \, e x\right ) +{\rm Li}_2\left (-\frac{1}{2} \, e x + 1\right ) \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(log(e*x-2)/x,x, algorithm="maxima")

[Out]

log(e*x - 2)*log(1/2*e*x) + dilog(-1/2*e*x + 1)

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Fricas [F]  time = 0., size = 0, normalized size = 0. \begin{align*}{\rm integral}\left (\frac{\log \left (e x - 2\right )}{x}, x\right ) \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(log(e*x-2)/x,x, algorithm="fricas")

[Out]

integral(log(e*x - 2)/x, x)

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Sympy [C]  time = 3.99814, size = 88, normalized size = 3.52 \begin{align*} \begin{cases} \log{\left (2 \right )} \log{\left (x \right )} + 3 i \pi \log{\left (x \right )} - \operatorname{Li}_{2}\left (\frac{e x}{2}\right ) & \text{for}\: \left |{x}\right | < 1 \\- \log{\left (2 \right )} \log{\left (\frac{1}{x} \right )} - 3 i \pi \log{\left (\frac{1}{x} \right )} - \operatorname{Li}_{2}\left (\frac{e x}{2}\right ) & \text{for}\: \frac{1}{\left |{x}\right |} < 1 \\-{G_{2, 2}^{2, 0}\left (\begin{matrix} & 1, 1 \\0, 0 & \end{matrix} \middle |{x} \right )} \log{\left (2 \right )} - 3 i \pi{G_{2, 2}^{2, 0}\left (\begin{matrix} & 1, 1 \\0, 0 & \end{matrix} \middle |{x} \right )} +{G_{2, 2}^{0, 2}\left (\begin{matrix} 1, 1 & \\ & 0, 0 \end{matrix} \middle |{x} \right )} \log{\left (2 \right )} + 3 i \pi{G_{2, 2}^{0, 2}\left (\begin{matrix} 1, 1 & \\ & 0, 0 \end{matrix} \middle |{x} \right )} - \operatorname{Li}_{2}\left (\frac{e x}{2}\right ) & \text{otherwise} \end{cases} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(ln(e*x-2)/x,x)

[Out]

Piecewise((log(2)*log(x) + 3*I*pi*log(x) - polylog(2, e*x/2), Abs(x) < 1), (-log(2)*log(1/x) - 3*I*pi*log(1/x)
- polylog(2, e*x/2), 1/Abs(x) < 1), (-meijerg(((), (1, 1)), ((0, 0), ()), x)*log(2) - 3*I*pi*meijerg(((), (1,
1)), ((0, 0), ()), x) + meijerg(((1, 1), ()), ((), (0, 0)), x)*log(2) + 3*I*pi*meijerg(((1, 1), ()), ((), (0,
0)), x) - polylog(2, e*x/2), True))

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Giac [F]  time = 0., size = 0, normalized size = 0. \begin{align*} \int \frac{\log \left (e x - 2\right )}{x}\,{d x} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(log(e*x-2)/x,x, algorithm="giac")

[Out]

integrate(log(e*x - 2)/x, x)