Optimal. Leaf size=51 \[ -\frac {1}{2} i \text {ArcCos}(a x)^2+\text {ArcCos}(a x) \log \left (1+e^{2 i \text {ArcCos}(a x)}\right )-\frac {1}{2} i \text {PolyLog}\left (2,-e^{2 i \text {ArcCos}(a x)}\right ) \]
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Rubi [A]
time = 0.04, antiderivative size = 51, normalized size of antiderivative = 1.00, number of steps
used = 5, number of rules used = 5, integrand size = 8, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.625, Rules used = {4722, 3800,
2221, 2317, 2438} \begin {gather*} -\frac {1}{2} i \text {Li}_2\left (-e^{2 i \text {ArcCos}(a x)}\right )-\frac {1}{2} i \text {ArcCos}(a x)^2+\text {ArcCos}(a x) \log \left (1+e^{2 i \text {ArcCos}(a x)}\right ) \end {gather*}
Antiderivative was successfully verified.
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Rule 2221
Rule 2317
Rule 2438
Rule 3800
Rule 4722
Rubi steps
\begin {align*} \int \frac {\cos ^{-1}(a x)}{x} \, dx &=-\text {Subst}\left (\int x \tan (x) \, dx,x,\cos ^{-1}(a x)\right )\\ &=-\frac {1}{2} i \cos ^{-1}(a x)^2+2 i \text {Subst}\left (\int \frac {e^{2 i x} x}{1+e^{2 i x}} \, dx,x,\cos ^{-1}(a x)\right )\\ &=-\frac {1}{2} i \cos ^{-1}(a x)^2+\cos ^{-1}(a x) \log \left (1+e^{2 i \cos ^{-1}(a x)}\right )-\text {Subst}\left (\int \log \left (1+e^{2 i x}\right ) \, dx,x,\cos ^{-1}(a x)\right )\\ &=-\frac {1}{2} i \cos ^{-1}(a x)^2+\cos ^{-1}(a x) \log \left (1+e^{2 i \cos ^{-1}(a x)}\right )+\frac {1}{2} i \text {Subst}\left (\int \frac {\log (1+x)}{x} \, dx,x,e^{2 i \cos ^{-1}(a x)}\right )\\ &=-\frac {1}{2} i \cos ^{-1}(a x)^2+\cos ^{-1}(a x) \log \left (1+e^{2 i \cos ^{-1}(a x)}\right )-\frac {1}{2} i \text {Li}_2\left (-e^{2 i \cos ^{-1}(a x)}\right )\\ \end {align*}
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Mathematica [A]
time = 0.01, size = 51, normalized size = 1.00 \begin {gather*} -\frac {1}{2} i \text {ArcCos}(a x)^2+\text {ArcCos}(a x) \log \left (1+e^{2 i \text {ArcCos}(a x)}\right )-\frac {1}{2} i \text {PolyLog}\left (2,-e^{2 i \text {ArcCos}(a x)}\right ) \end {gather*}
Antiderivative was successfully verified.
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Maple [A]
time = 0.31, size = 68, normalized size = 1.33
method | result | size |
derivativedivides | \(-\frac {i \arccos \left (a x \right )^{2}}{2}+\arccos \left (a x \right ) \ln \left (1+\left (a x +i \sqrt {-a^{2} x^{2}+1}\right )^{2}\right )-\frac {i \polylog \left (2, -\left (a x +i \sqrt {-a^{2} x^{2}+1}\right )^{2}\right )}{2}\) | \(68\) |
default | \(-\frac {i \arccos \left (a x \right )^{2}}{2}+\arccos \left (a x \right ) \ln \left (1+\left (a x +i \sqrt {-a^{2} x^{2}+1}\right )^{2}\right )-\frac {i \polylog \left (2, -\left (a x +i \sqrt {-a^{2} x^{2}+1}\right )^{2}\right )}{2}\) | \(68\) |
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [F]
time = 0.00, size = 0, normalized size = 0.00 \begin {gather*} \text {Failed to integrate} \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [F]
time = 0.00, size = 0, normalized size = 0.00 \begin {gather*} \text {could not integrate} \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [F]
time = 0.00, size = 0, normalized size = 0.00 \begin {gather*} \int \frac {\operatorname {acos}{\left (a x \right )}}{x}\, dx \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [F]
time = 0.00, size = 0, normalized size = 0.00 \begin {gather*} \text {could not integrate} \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Mupad [F]
time = 0.00, size = -1, normalized size = -0.02 \begin {gather*} \int \frac {\mathrm {acos}\left (a\,x\right )}{x} \,d x \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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