Integrand size = 13, antiderivative size = 79 \[ \int \frac {x^3 \arctan (x)}{\left (1+x^2\right )^2} \, dx=-\frac {x}{4 \left (1+x^2\right )}-\frac {\arctan (x)}{4}+\frac {\arctan (x)}{2 \left (1+x^2\right )}-\frac {1}{2} i \arctan (x)^2-\arctan (x) \log \left (\frac {2}{1+i x}\right )-\frac {1}{2} i \operatorname {PolyLog}\left (2,1-\frac {2}{1+i x}\right ) \]
-1/4*x/(x^2+1)-1/4*arctan(x)+1/2*arctan(x)/(x^2+1)-1/2*I*arctan(x)^2-arcta n(x)*ln(2/(1+I*x))-1/2*I*polylog(2,1-2/(1+I*x))
Time = 0.04 (sec) , antiderivative size = 64, normalized size of antiderivative = 0.81 \[ \int \frac {x^3 \arctan (x)}{\left (1+x^2\right )^2} \, dx=\frac {1}{2} i \arctan (x)^2+\frac {1}{4} \arctan (x) \cos (2 \arctan (x))-\arctan (x) \log \left (1+e^{2 i \arctan (x)}\right )+\frac {1}{2} i \operatorname {PolyLog}\left (2,-e^{2 i \arctan (x)}\right )-\frac {1}{8} \sin (2 \arctan (x)) \]
(I/2)*ArcTan[x]^2 + (ArcTan[x]*Cos[2*ArcTan[x]])/4 - ArcTan[x]*Log[1 + E^( (2*I)*ArcTan[x])] + (I/2)*PolyLog[2, -E^((2*I)*ArcTan[x])] - Sin[2*ArcTan[ x]]/8
Time = 0.50 (sec) , antiderivative size = 84, normalized size of antiderivative = 1.06, number of steps used = 9, number of rules used = 8, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.615, Rules used = {5499, 5455, 5379, 2849, 2752, 5465, 215, 216}
Below are the steps used by Rubi to obtain the solution. The rule number used for the transformation is given above next to the arrow. The rules definitions used are listed below.
\(\displaystyle \int \frac {x^3 \arctan (x)}{\left (x^2+1\right )^2} \, dx\) |
\(\Big \downarrow \) 5499 |
\(\displaystyle \int \frac {x \arctan (x)}{x^2+1}dx-\int \frac {x \arctan (x)}{\left (x^2+1\right )^2}dx\) |
\(\Big \downarrow \) 5455 |
\(\displaystyle -\int \frac {x \arctan (x)}{\left (x^2+1\right )^2}dx-\int \frac {\arctan (x)}{i-x}dx-\frac {1}{2} i \arctan (x)^2\) |
\(\Big \downarrow \) 5379 |
\(\displaystyle -\int \frac {x \arctan (x)}{\left (x^2+1\right )^2}dx+\int \frac {\log \left (\frac {2}{i x+1}\right )}{x^2+1}dx-\frac {1}{2} i \arctan (x)^2-\arctan (x) \log \left (\frac {2}{1+i x}\right )\) |
\(\Big \downarrow \) 2849 |
\(\displaystyle -\int \frac {x \arctan (x)}{\left (x^2+1\right )^2}dx-i \int \frac {\log \left (\frac {2}{i x+1}\right )}{1-\frac {2}{i x+1}}d\frac {1}{i x+1}-\frac {1}{2} i \arctan (x)^2-\arctan (x) \log \left (\frac {2}{1+i x}\right )\) |
\(\Big \downarrow \) 2752 |
\(\displaystyle -\int \frac {x \arctan (x)}{\left (x^2+1\right )^2}dx-\frac {1}{2} i \arctan (x)^2-\arctan (x) \log \left (\frac {2}{1+i x}\right )-\frac {1}{2} i \operatorname {PolyLog}\left (2,1-\frac {2}{i x+1}\right )\) |
\(\Big \downarrow \) 5465 |
\(\displaystyle -\frac {1}{2} \int \frac {1}{\left (x^2+1\right )^2}dx+\frac {\arctan (x)}{2 \left (x^2+1\right )}-\frac {1}{2} i \arctan (x)^2-\arctan (x) \log \left (\frac {2}{1+i x}\right )-\frac {1}{2} i \operatorname {PolyLog}\left (2,1-\frac {2}{i x+1}\right )\) |
\(\Big \downarrow \) 215 |
\(\displaystyle \frac {1}{2} \left (-\frac {1}{2} \int \frac {1}{x^2+1}dx-\frac {x}{2 \left (x^2+1\right )}\right )+\frac {\arctan (x)}{2 \left (x^2+1\right )}-\frac {1}{2} i \arctan (x)^2-\arctan (x) \log \left (\frac {2}{1+i x}\right )-\frac {1}{2} i \operatorname {PolyLog}\left (2,1-\frac {2}{i x+1}\right )\) |
\(\Big \downarrow \) 216 |
\(\displaystyle \frac {\arctan (x)}{2 \left (x^2+1\right )}+\frac {1}{2} \left (-\frac {\arctan (x)}{2}-\frac {x}{2 \left (x^2+1\right )}\right )-\frac {1}{2} i \arctan (x)^2-\arctan (x) \log \left (\frac {2}{1+i x}\right )-\frac {1}{2} i \operatorname {PolyLog}\left (2,1-\frac {2}{i x+1}\right )\) |
(-1/2*x/(1 + x^2) - ArcTan[x]/2)/2 + ArcTan[x]/(2*(1 + x^2)) - (I/2)*ArcTa n[x]^2 - ArcTan[x]*Log[2/(1 + I*x)] - (I/2)*PolyLog[2, 1 - 2/(1 + I*x)]
3.7.74.3.1 Defintions of rubi rules used
Int[((a_) + (b_.)*(x_)^2)^(p_), x_Symbol] :> Simp[(-x)*((a + b*x^2)^(p + 1) /(2*a*(p + 1))), x] + Simp[(2*p + 3)/(2*a*(p + 1)) Int[(a + b*x^2)^(p + 1 ), x], x] /; FreeQ[{a, b}, x] && LtQ[p, -1] && (IntegerQ[4*p] || IntegerQ[6 *p])
Int[((a_) + (b_.)*(x_)^2)^(-1), x_Symbol] :> Simp[(1/(Rt[a, 2]*Rt[b, 2]))*A rcTan[Rt[b, 2]*(x/Rt[a, 2])], x] /; FreeQ[{a, b}, x] && PosQ[a/b] && (GtQ[a , 0] || GtQ[b, 0])
Int[Log[(c_.)*(x_)]/((d_) + (e_.)*(x_)), x_Symbol] :> Simp[(-e^(-1))*PolyLo g[2, 1 - c*x], x] /; FreeQ[{c, d, e}, x] && EqQ[e + c*d, 0]
Int[Log[(c_.)/((d_) + (e_.)*(x_))]/((f_) + (g_.)*(x_)^2), x_Symbol] :> Simp [-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]
Int[((a_.) + ArcTan[(c_.)*(x_)]*(b_.))^(p_.)/((d_) + (e_.)*(x_)), x_Symbol] :> Simp[(-(a + b*ArcTan[c*x])^p)*(Log[2/(1 + e*(x/d))]/e), x] + Simp[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 ]
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] - Si mp[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]
Int[((a_.) + ArcTan[(c_.)*(x_)]*(b_.))^(p_.)*(x_)*((d_) + (e_.)*(x_)^2)^(q_ .), x_Symbol] :> Simp[(d + e*x^2)^(q + 1)*((a + b*ArcTan[c*x])^p/(2*e*(q + 1))), x] - Simp[b*(p/(2*c*(q + 1))) Int[(d + e*x^2)^q*(a + b*ArcTan[c*x]) ^(p - 1), x], x] /; FreeQ[{a, b, c, d, e, q}, x] && EqQ[e, c^2*d] && GtQ[p, 0] && NeQ[q, -1]
Int[((a_.) + ArcTan[(c_.)*(x_)]*(b_.))^(p_.)*(x_)^(m_)*((d_) + (e_.)*(x_)^2 )^(q_), x_Symbol] :> Simp[1/e Int[x^(m - 2)*(d + e*x^2)^(q + 1)*(a + b*Ar cTan[c*x])^p, x], x] - Simp[d/e Int[x^(m - 2)*(d + e*x^2)^q*(a + b*ArcTan [c*x])^p, x], x] /; FreeQ[{a, b, c, d, e}, x] && EqQ[e, c^2*d] && IntegersQ [p, 2*q] && LtQ[q, -1] && IGtQ[m, 1] && NeQ[p, -1]
Both result and optimal contain complex but leaf count of result is larger than twice the leaf count of optimal. 136 vs. \(2 (65 ) = 130\).
Time = 0.35 (sec) , antiderivative size = 137, normalized size of antiderivative = 1.73
method | result | size |
default | \(\frac {\arctan \left (x \right )}{2 x^{2}+2}+\frac {\arctan \left (x \right ) \ln \left (x^{2}+1\right )}{2}-\frac {x}{4 \left (x^{2}+1\right )}-\frac {\arctan \left (x \right )}{4}+\frac {i \left (\ln \left (x -i\right ) \ln \left (x^{2}+1\right )-\frac {\ln \left (x -i\right )^{2}}{2}-\operatorname {dilog}\left (-\frac {i \left (x +i\right )}{2}\right )-\ln \left (x -i\right ) \ln \left (-\frac {i \left (x +i\right )}{2}\right )\right )}{4}-\frac {i \left (\ln \left (x +i\right ) \ln \left (x^{2}+1\right )-\frac {\ln \left (x +i\right )^{2}}{2}-\operatorname {dilog}\left (\frac {i \left (x -i\right )}{2}\right )-\ln \left (x +i\right ) \ln \left (\frac {i \left (x -i\right )}{2}\right )\right )}{4}\) | \(137\) |
parts | \(\frac {\arctan \left (x \right )}{2 x^{2}+2}+\frac {\arctan \left (x \right ) \ln \left (x^{2}+1\right )}{2}-\frac {x}{4 \left (x^{2}+1\right )}-\frac {\arctan \left (x \right )}{4}+\frac {i \left (\ln \left (x -i\right ) \ln \left (x^{2}+1\right )-\frac {\ln \left (x -i\right )^{2}}{2}-\operatorname {dilog}\left (-\frac {i \left (x +i\right )}{2}\right )-\ln \left (x -i\right ) \ln \left (-\frac {i \left (x +i\right )}{2}\right )\right )}{4}-\frac {i \left (\ln \left (x +i\right ) \ln \left (x^{2}+1\right )-\frac {\ln \left (x +i\right )^{2}}{2}-\operatorname {dilog}\left (\frac {i \left (x -i\right )}{2}\right )-\ln \left (x +i\right ) \ln \left (\frac {i \left (x -i\right )}{2}\right )\right )}{4}\) | \(137\) |
risch | \(\frac {i \ln \left (-i x +1\right )^{2}}{8}+\frac {i \operatorname {dilog}\left (\frac {1}{2}+\frac {i x}{2}\right )}{4}+\frac {i \ln \left (i x +1\right )}{16 i x -16}+\frac {i}{-8 i x +8}+\frac {i \ln \left (\frac {1}{2}+\frac {i x}{2}\right ) \ln \left (-i x +1\right )}{4}-\frac {i \operatorname {dilog}\left (\frac {1}{2}-\frac {i x}{2}\right )}{4}-\frac {i}{8 \left (i x +1\right )}-\frac {\arctan \left (x \right )}{8}-\frac {\ln \left (-i x +1\right ) x}{16 \left (-i x -1\right )}-\frac {i \ln \left (-i x +1\right )}{16 \left (-i x -1\right )}-\frac {i \ln \left (i x +1\right )}{8 \left (i x +1\right )}-\frac {i \ln \left (i x +1\right )^{2}}{8}+\frac {i \ln \left (-i x +1\right )}{-8 i x +8}-\frac {i \ln \left (\frac {1}{2}-\frac {i x}{2}\right ) \ln \left (i x +1\right )}{4}-\frac {\ln \left (i x +1\right ) x}{16 \left (i x -1\right )}\) | \(214\) |
1/2*arctan(x)/(x^2+1)+1/2*arctan(x)*ln(x^2+1)-1/4*x/(x^2+1)-1/4*arctan(x)+ 1/4*I*(ln(x-I)*ln(x^2+1)-1/2*ln(x-I)^2-dilog(-1/2*I*(x+I))-ln(x-I)*ln(-1/2 *I*(x+I)))-1/4*I*(ln(x+I)*ln(x^2+1)-1/2*ln(x+I)^2-dilog(1/2*I*(x-I))-ln(x+ I)*ln(1/2*I*(x-I)))
\[ \int \frac {x^3 \arctan (x)}{\left (1+x^2\right )^2} \, dx=\int { \frac {x^{3} \arctan \left (x\right )}{{\left (x^{2} + 1\right )}^{2}} \,d x } \]
Exception generated. \[ \int \frac {x^3 \arctan (x)}{\left (1+x^2\right )^2} \, dx=\text {Exception raised: RecursionError} \]
Exception raised: RecursionError >> maximum recursion depth exceeded while calling a Python object
\[ \int \frac {x^3 \arctan (x)}{\left (1+x^2\right )^2} \, dx=\int { \frac {x^{3} \arctan \left (x\right )}{{\left (x^{2} + 1\right )}^{2}} \,d x } \]
\[ \int \frac {x^3 \arctan (x)}{\left (1+x^2\right )^2} \, dx=\int { \frac {x^{3} \arctan \left (x\right )}{{\left (x^{2} + 1\right )}^{2}} \,d x } \]
Timed out. \[ \int \frac {x^3 \arctan (x)}{\left (1+x^2\right )^2} \, dx=\int \frac {x^3\,\mathrm {atan}\left (x\right )}{{\left (x^2+1\right )}^2} \,d x \]
\[ \int \frac {x^3 \arctan (x)}{\left (1+x^2\right )^2} \, dx=\int \frac {\mathit {atan} \left (x \right ) x^{3}}{x^{4}+2 x^{2}+1}d x \]