3.17 \(\int \frac{\cos ^{-1}(a x)^2}{x} \, dx\)

Optimal. Leaf size=73 \[ -i \cos ^{-1}(a x) \text{PolyLog}\left (2,-e^{2 i \cos ^{-1}(a x)}\right )+\frac{1}{2} \text{PolyLog}\left (3,-e^{2 i \cos ^{-1}(a x)}\right )-\frac{1}{3} i \cos ^{-1}(a x)^3+\cos ^{-1}(a x)^2 \log \left (1+e^{2 i \cos ^{-1}(a x)}\right ) \]

[Out]

(-I/3)*ArcCos[a*x]^3 + ArcCos[a*x]^2*Log[1 + E^((2*I)*ArcCos[a*x])] - I*ArcCos[a*x]*PolyLog[2, -E^((2*I)*ArcCo
s[a*x])] + PolyLog[3, -E^((2*I)*ArcCos[a*x])]/2

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Rubi [A]  time = 0.0933503, antiderivative size = 73, normalized size of antiderivative = 1., number of steps used = 6, number of rules used = 6, integrand size = 10, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.6, Rules used = {4626, 3719, 2190, 2531, 2282, 6589} \[ -i \cos ^{-1}(a x) \text{PolyLog}\left (2,-e^{2 i \cos ^{-1}(a x)}\right )+\frac{1}{2} \text{PolyLog}\left (3,-e^{2 i \cos ^{-1}(a x)}\right )-\frac{1}{3} i \cos ^{-1}(a x)^3+\cos ^{-1}(a x)^2 \log \left (1+e^{2 i \cos ^{-1}(a x)}\right ) \]

Antiderivative was successfully verified.

[In]

Int[ArcCos[a*x]^2/x,x]

[Out]

(-I/3)*ArcCos[a*x]^3 + ArcCos[a*x]^2*Log[1 + E^((2*I)*ArcCos[a*x])] - I*ArcCos[a*x]*PolyLog[2, -E^((2*I)*ArcCo
s[a*x])] + PolyLog[3, -E^((2*I)*ArcCos[a*x])]/2

Rule 4626

Int[((a_.) + ArcCos[(c_.)*(x_)]*(b_.))^(n_.)/(x_), x_Symbol] :> -Subst[Int[(a + b*x)^n/Cot[x], x], x, ArcCos[c
*x]] /; FreeQ[{a, b, c}, x] && IGtQ[n, 0]

Rule 3719

Int[((c_.) + (d_.)*(x_))^(m_.)*tan[(e_.) + (f_.)*(x_)], x_Symbol] :> Simp[(I*(c + d*x)^(m + 1))/(d*(m + 1)), x
] - Dist[2*I, Int[((c + d*x)^m*E^(2*I*(e + f*x)))/(1 + E^(2*I*(e + f*x))), x], x] /; FreeQ[{c, d, e, f}, x] &&
IGtQ[m, 0]

Rule 2190

Int[(((F_)^((g_.)*((e_.) + (f_.)*(x_))))^(n_.)*((c_.) + (d_.)*(x_))^(m_.))/((a_) + (b_.)*((F_)^((g_.)*((e_.) +
(f_.)*(x_))))^(n_.)), x_Symbol] :> Simp[((c + d*x)^m*Log[1 + (b*(F^(g*(e + f*x)))^n)/a])/(b*f*g*n*Log[F]), x]
- Dist[(d*m)/(b*f*g*n*Log[F]), Int[(c + d*x)^(m - 1)*Log[1 + (b*(F^(g*(e + f*x)))^n)/a], x], x] /; FreeQ[{F,
a, b, c, d, e, f, g, n}, x] && IGtQ[m, 0]

Rule 2531

Int[Log[1 + (e_.)*((F_)^((c_.)*((a_.) + (b_.)*(x_))))^(n_.)]*((f_.) + (g_.)*(x_))^(m_.), x_Symbol] :> -Simp[((
f + g*x)^m*PolyLog[2, -(e*(F^(c*(a + b*x)))^n)])/(b*c*n*Log[F]), x] + Dist[(g*m)/(b*c*n*Log[F]), Int[(f + g*x)
^(m - 1)*PolyLog[2, -(e*(F^(c*(a + b*x)))^n)], x], x] /; FreeQ[{F, a, b, c, e, f, g, n}, x] && GtQ[m, 0]

Rule 2282

Int[u_, x_Symbol] :> With[{v = FunctionOfExponential[u, x]}, Dist[v/D[v, x], Subst[Int[FunctionOfExponentialFu
nction[u, x]/x, x], x, v], x]] /; FunctionOfExponentialQ[u, x] &&  !MatchQ[u, (w_)*((a_.)*(v_)^(n_))^(m_) /; F
reeQ[{a, m, n}, x] && IntegerQ[m*n]] &&  !MatchQ[u, E^((c_.)*((a_.) + (b_.)*x))*(F_)[v_] /; FreeQ[{a, b, c}, x
] && InverseFunctionQ[F[x]]]

Rule 6589

Int[PolyLog[n_, (c_.)*((a_.) + (b_.)*(x_))^(p_.)]/((d_.) + (e_.)*(x_)), x_Symbol] :> Simp[PolyLog[n + 1, c*(a
+ b*x)^p]/(e*p), x] /; FreeQ[{a, b, c, d, e, n, p}, x] && EqQ[b*d, a*e]

Rubi steps

\begin{align*} \int \frac{\cos ^{-1}(a x)^2}{x} \, dx &=-\operatorname{Subst}\left (\int x^2 \tan (x) \, dx,x,\cos ^{-1}(a x)\right )\\ &=-\frac{1}{3} i \cos ^{-1}(a x)^3+2 i \operatorname{Subst}\left (\int \frac{e^{2 i x} x^2}{1+e^{2 i x}} \, dx,x,\cos ^{-1}(a x)\right )\\ &=-\frac{1}{3} i \cos ^{-1}(a x)^3+\cos ^{-1}(a x)^2 \log \left (1+e^{2 i \cos ^{-1}(a x)}\right )-2 \operatorname{Subst}\left (\int x \log \left (1+e^{2 i x}\right ) \, dx,x,\cos ^{-1}(a x)\right )\\ &=-\frac{1}{3} i \cos ^{-1}(a x)^3+\cos ^{-1}(a x)^2 \log \left (1+e^{2 i \cos ^{-1}(a x)}\right )-i \cos ^{-1}(a x) \text{Li}_2\left (-e^{2 i \cos ^{-1}(a x)}\right )+i \operatorname{Subst}\left (\int \text{Li}_2\left (-e^{2 i x}\right ) \, dx,x,\cos ^{-1}(a x)\right )\\ &=-\frac{1}{3} i \cos ^{-1}(a x)^3+\cos ^{-1}(a x)^2 \log \left (1+e^{2 i \cos ^{-1}(a x)}\right )-i \cos ^{-1}(a x) \text{Li}_2\left (-e^{2 i \cos ^{-1}(a x)}\right )+\frac{1}{2} \operatorname{Subst}\left (\int \frac{\text{Li}_2(-x)}{x} \, dx,x,e^{2 i \cos ^{-1}(a x)}\right )\\ &=-\frac{1}{3} i \cos ^{-1}(a x)^3+\cos ^{-1}(a x)^2 \log \left (1+e^{2 i \cos ^{-1}(a x)}\right )-i \cos ^{-1}(a x) \text{Li}_2\left (-e^{2 i \cos ^{-1}(a x)}\right )+\frac{1}{2} \text{Li}_3\left (-e^{2 i \cos ^{-1}(a x)}\right )\\ \end{align*}

Mathematica [A]  time = 0.0196891, size = 73, normalized size = 1. \[ -i \cos ^{-1}(a x) \text{PolyLog}\left (2,-e^{2 i \cos ^{-1}(a x)}\right )+\frac{1}{2} \text{PolyLog}\left (3,-e^{2 i \cos ^{-1}(a x)}\right )-\frac{1}{3} i \cos ^{-1}(a x)^3+\cos ^{-1}(a x)^2 \log \left (1+e^{2 i \cos ^{-1}(a x)}\right ) \]

Antiderivative was successfully verified.

[In]

Integrate[ArcCos[a*x]^2/x,x]

[Out]

(-I/3)*ArcCos[a*x]^3 + ArcCos[a*x]^2*Log[1 + E^((2*I)*ArcCos[a*x])] - I*ArcCos[a*x]*PolyLog[2, -E^((2*I)*ArcCo
s[a*x])] + PolyLog[3, -E^((2*I)*ArcCos[a*x])]/2

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Maple [A]  time = 0.054, size = 101, normalized size = 1.4 \begin{align*} -{\frac{i}{3}} \left ( \arccos \left ( ax \right ) \right ) ^{3}+ \left ( \arccos \left ( ax \right ) \right ) ^{2}\ln \left ( 1+ \left ( i\sqrt{-{a}^{2}{x}^{2}+1}+ax \right ) ^{2} \right ) -i\arccos \left ( ax \right ){\it polylog} \left ( 2,- \left ( i\sqrt{-{a}^{2}{x}^{2}+1}+ax \right ) ^{2} \right ) +{\frac{1}{2}{\it polylog} \left ( 3,- \left ( i\sqrt{-{a}^{2}{x}^{2}+1}+ax \right ) ^{2} \right ) } \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(arccos(a*x)^2/x,x)

[Out]

-1/3*I*arccos(a*x)^3+arccos(a*x)^2*ln(1+(I*(-a^2*x^2+1)^(1/2)+a*x)^2)-I*arccos(a*x)*polylog(2,-(I*(-a^2*x^2+1)
^(1/2)+a*x)^2)+1/2*polylog(3,-(I*(-a^2*x^2+1)^(1/2)+a*x)^2)

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Maxima [F]  time = 0., size = 0, normalized size = 0. \begin{align*} \int \frac{\arccos \left (a x\right )^{2}}{x}\,{d x} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(arccos(a*x)^2/x,x, algorithm="maxima")

[Out]

integrate(arccos(a*x)^2/x, x)

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

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(arccos(a*x)^2/x,x, algorithm="fricas")

[Out]

integral(arccos(a*x)^2/x, x)

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Sympy [F]  time = 0., size = 0, normalized size = 0. \begin{align*} \int \frac{\operatorname{acos}^{2}{\left (a x \right )}}{x}\, dx \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(acos(a*x)**2/x,x)

[Out]

Integral(acos(a*x)**2/x, x)

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

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(arccos(a*x)^2/x,x, algorithm="giac")

[Out]

integrate(arccos(a*x)^2/x, x)