3.672 \(\int \frac{x^3 \tan ^{-1}(x)}{1+x^2} \, dx\)

Optimal. Leaf size=67 \[ \frac{1}{2} i \text{PolyLog}\left (2,1-\frac{2}{1+i x}\right )+\frac{1}{2} x^2 \tan ^{-1}(x)-\frac{x}{2}+\frac{1}{2} i \tan ^{-1}(x)^2+\frac{1}{2} \tan ^{-1}(x)+\log \left (\frac{2}{1+i x}\right ) \tan ^{-1}(x) \]

[Out]

-x/2 + ArcTan[x]/2 + (x^2*ArcTan[x])/2 + (I/2)*ArcTan[x]^2 + ArcTan[x]*Log[2/(1 + I*x)] + (I/2)*PolyLog[2, 1 -
2/(1 + I*x)]

________________________________________________________________________________________

Rubi [A]  time = 0.0937433, antiderivative size = 67, normalized size of antiderivative = 1., number of steps used = 8, number of rules used = 8, integrand size = 13, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.615, Rules used = {4916, 4852, 321, 203, 4920, 4854, 2402, 2315} \[ \frac{1}{2} i \text{PolyLog}\left (2,1-\frac{2}{1+i x}\right )+\frac{1}{2} x^2 \tan ^{-1}(x)-\frac{x}{2}+\frac{1}{2} i \tan ^{-1}(x)^2+\frac{1}{2} \tan ^{-1}(x)+\log \left (\frac{2}{1+i x}\right ) \tan ^{-1}(x) \]

Antiderivative was successfully verified.

[In]

Int[(x^3*ArcTan[x])/(1 + x^2),x]

[Out]

-x/2 + ArcTan[x]/2 + (x^2*ArcTan[x])/2 + (I/2)*ArcTan[x]^2 + ArcTan[x]*Log[2/(1 + I*x)] + (I/2)*PolyLog[2, 1 -
2/(1 + I*x)]

Rule 4916

Int[(((a_.) + ArcTan[(c_.)*(x_)]*(b_.))^(p_.)*((f_.)*(x_))^(m_))/((d_) + (e_.)*(x_)^2), x_Symbol] :> Dist[f^2/
e, Int[(f*x)^(m - 2)*(a + b*ArcTan[c*x])^p, x], x] - Dist[(d*f^2)/e, Int[((f*x)^(m - 2)*(a + b*ArcTan[c*x])^p)
/(d + e*x^2), x], x] /; FreeQ[{a, b, c, d, e, f}, x] && GtQ[p, 0] && GtQ[m, 1]

Rule 4852

Int[((a_.) + ArcTan[(c_.)*(x_)]*(b_.))^(p_.)*((d_.)*(x_))^(m_.), x_Symbol] :> Simp[((d*x)^(m + 1)*(a + b*ArcTa
n[c*x])^p)/(d*(m + 1)), x] - Dist[(b*c*p)/(d*(m + 1)), Int[((d*x)^(m + 1)*(a + b*ArcTan[c*x])^(p - 1))/(1 + c^
2*x^2), x], x] /; FreeQ[{a, b, c, d, m}, x] && IGtQ[p, 0] && (EqQ[p, 1] || IntegerQ[m]) && NeQ[m, -1]

Rule 321

Int[((c_.)*(x_))^(m_)*((a_) + (b_.)*(x_)^(n_))^(p_), x_Symbol] :> Simp[(c^(n - 1)*(c*x)^(m - n + 1)*(a + b*x^n
)^(p + 1))/(b*(m + n*p + 1)), x] - Dist[(a*c^n*(m - n + 1))/(b*(m + n*p + 1)), Int[(c*x)^(m - n)*(a + b*x^n)^p
, x], x] /; FreeQ[{a, b, c, p}, x] && IGtQ[n, 0] && GtQ[m, n - 1] && NeQ[m + n*p + 1, 0] && IntBinomialQ[a, b,
c, n, m, p, x]

Rule 203

Int[((a_) + (b_.)*(x_)^2)^(-1), x_Symbol] :> Simp[(1*ArcTan[(Rt[b, 2]*x)/Rt[a, 2]])/(Rt[a, 2]*Rt[b, 2]), x] /;
FreeQ[{a, b}, x] && PosQ[a/b] && (GtQ[a, 0] || GtQ[b, 0])

Rule 4920

Int[(((a_.) + ArcTan[(c_.)*(x_)]*(b_.))^(p_.)*(x_))/((d_) + (e_.)*(x_)^2), x_Symbol] :> -Simp[(I*(a + b*ArcTan
[c*x])^(p + 1))/(b*e*(p + 1)), x] - Dist[1/(c*d), Int[(a + b*ArcTan[c*x])^p/(I - c*x), x], x] /; FreeQ[{a, b,
c, d, e}, x] && EqQ[e, c^2*d] && IGtQ[p, 0]

Rule 4854

Int[((a_.) + ArcTan[(c_.)*(x_)]*(b_.))^(p_.)/((d_) + (e_.)*(x_)), x_Symbol] :> -Simp[((a + b*ArcTan[c*x])^p*Lo
g[2/(1 + (e*x)/d)])/e, x] + Dist[(b*c*p)/e, Int[((a + b*ArcTan[c*x])^(p - 1)*Log[2/(1 + (e*x)/d)])/(1 + c^2*x^
2), x], x] /; FreeQ[{a, b, c, d, e}, x] && IGtQ[p, 0] && EqQ[c^2*d^2 + e^2, 0]

Rule 2402

Int[Log[(c_.)/((d_) + (e_.)*(x_))]/((f_) + (g_.)*(x_)^2), x_Symbol] :> -Dist[e/g, Subst[Int[Log[2*d*x]/(1 - 2*
d*x), x], x, 1/(d + e*x)], x] /; FreeQ[{c, d, e, f, g}, x] && EqQ[c, 2*d] && EqQ[e^2*f + d^2*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{x^3 \tan ^{-1}(x)}{1+x^2} \, dx &=\int x \tan ^{-1}(x) \, dx-\int \frac{x \tan ^{-1}(x)}{1+x^2} \, dx\\ &=\frac{1}{2} x^2 \tan ^{-1}(x)+\frac{1}{2} i \tan ^{-1}(x)^2-\frac{1}{2} \int \frac{x^2}{1+x^2} \, dx+\int \frac{\tan ^{-1}(x)}{i-x} \, dx\\ &=-\frac{x}{2}+\frac{1}{2} x^2 \tan ^{-1}(x)+\frac{1}{2} i \tan ^{-1}(x)^2+\tan ^{-1}(x) \log \left (\frac{2}{1+i x}\right )+\frac{1}{2} \int \frac{1}{1+x^2} \, dx-\int \frac{\log \left (\frac{2}{1+i x}\right )}{1+x^2} \, dx\\ &=-\frac{x}{2}+\frac{1}{2} \tan ^{-1}(x)+\frac{1}{2} x^2 \tan ^{-1}(x)+\frac{1}{2} i \tan ^{-1}(x)^2+\tan ^{-1}(x) \log \left (\frac{2}{1+i x}\right )+i \operatorname{Subst}\left (\int \frac{\log (2 x)}{1-2 x} \, dx,x,\frac{1}{1+i x}\right )\\ &=-\frac{x}{2}+\frac{1}{2} \tan ^{-1}(x)+\frac{1}{2} x^2 \tan ^{-1}(x)+\frac{1}{2} i \tan ^{-1}(x)^2+\tan ^{-1}(x) \log \left (\frac{2}{1+i x}\right )+\frac{1}{2} i \text{Li}_2\left (1-\frac{2}{1+i x}\right )\\ \end{align*}

Mathematica [A]  time = 0.0323023, size = 57, normalized size = 0.85 \[ \frac{1}{2} \left (i \text{PolyLog}\left (2,\frac{x+i}{x-i}\right )+\left (x^2+2 \log \left (-\frac{2 i}{x-i}\right )+1\right ) \tan ^{-1}(x)-x+i \tan ^{-1}(x)^2\right ) \]

Antiderivative was successfully verified.

[In]

Integrate[(x^3*ArcTan[x])/(1 + x^2),x]

[Out]

(-x + I*ArcTan[x]^2 + ArcTan[x]*(1 + x^2 + 2*Log[(-2*I)/(-I + x)]) + I*PolyLog[2, (I + x)/(-I + x)])/2

________________________________________________________________________________________

Maple [B]  time = 0.031, size = 128, normalized size = 1.9 \begin{align*}{\frac{{x}^{2}\arctan \left ( x \right ) }{2}}-{\frac{\arctan \left ( x \right ) \ln \left ({x}^{2}+1 \right ) }{2}}-{\frac{x}{2}}+{\frac{\arctan \left ( x \right ) }{2}}+{\frac{i}{4}}\ln \left ( -{\frac{i}{2}} \left ( x+i \right ) \right ) \ln \left ( x-i \right ) +{\frac{i}{8}} \left ( \ln \left ( x-i \right ) \right ) ^{2}-{\frac{i}{4}}\ln \left ( x-i \right ) \ln \left ({x}^{2}+1 \right ) +{\frac{i}{4}}{\it dilog} \left ( -{\frac{i}{2}} \left ( x+i \right ) \right ) -{\frac{i}{4}}\ln \left ({\frac{i}{2}} \left ( x-i \right ) \right ) \ln \left ( x+i \right ) -{\frac{i}{8}} \left ( \ln \left ( x+i \right ) \right ) ^{2}+{\frac{i}{4}}\ln \left ( x+i \right ) \ln \left ({x}^{2}+1 \right ) -{\frac{i}{4}}{\it dilog} \left ({\frac{i}{2}} \left ( x-i \right ) \right ) \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(x^3*arctan(x)/(x^2+1),x)

[Out]

1/2*x^2*arctan(x)-1/2*arctan(x)*ln(x^2+1)-1/2*x+1/2*arctan(x)+1/4*I*ln(-1/2*I*(x+I))*ln(x-I)+1/8*I*ln(x-I)^2-1
/4*I*ln(x-I)*ln(x^2+1)+1/4*I*dilog(-1/2*I*(x+I))-1/4*I*ln(1/2*I*(x-I))*ln(x+I)-1/8*I*ln(x+I)^2+1/4*I*ln(x+I)*l
n(x^2+1)-1/4*I*dilog(1/2*I*(x-I))

________________________________________________________________________________________

Maxima [F]  time = 0., size = 0, normalized size = 0. \begin{align*} \int \frac{x^{3} \arctan \left (x\right )}{x^{2} + 1}\,{d x} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x^3*arctan(x)/(x^2+1),x, algorithm="maxima")

[Out]

integrate(x^3*arctan(x)/(x^2 + 1), x)

________________________________________________________________________________________

Fricas [F]  time = 0., size = 0, normalized size = 0. \begin{align*}{\rm integral}\left (\frac{x^{3} \arctan \left (x\right )}{x^{2} + 1}, x\right ) \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x^3*arctan(x)/(x^2+1),x, algorithm="fricas")

[Out]

integral(x^3*arctan(x)/(x^2 + 1), x)

________________________________________________________________________________________

Sympy [F]  time = 0., size = 0, normalized size = 0. \begin{align*} \int \frac{x^{3} \operatorname{atan}{\left (x \right )}}{x^{2} + 1}\, dx \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x**3*atan(x)/(x**2+1),x)

[Out]

Integral(x**3*atan(x)/(x**2 + 1), x)

________________________________________________________________________________________

Giac [F]  time = 0., size = 0, normalized size = 0. \begin{align*} \int \frac{x^{3} \arctan \left (x\right )}{x^{2} + 1}\,{d x} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x^3*arctan(x)/(x^2+1),x, algorithm="giac")

[Out]

integrate(x^3*arctan(x)/(x^2 + 1), x)