Integrand size = 21, antiderivative size = 130 \[ \int \frac {x^3 (a+b \arctan (c x))}{\left (d+e x^2\right )^3} \, dx=\frac {b c x}{8 \left (c^2 d-e\right ) e \left (d+e x^2\right )}-\frac {b \arctan (c x)}{4 d \left (c^2 d-e\right )^2}+\frac {x^4 (a+b \arctan (c x))}{4 d \left (d+e x^2\right )^2}-\frac {b c \left (c^2 d-3 e\right ) \arctan \left (\frac {\sqrt {e} x}{\sqrt {d}}\right )}{8 \sqrt {d} \left (c^2 d-e\right )^2 e^{3/2}} \]
1/8*b*c*x/(c^2*d-e)/e/(e*x^2+d)-1/4*b*arctan(c*x)/d/(c^2*d-e)^2+1/4*x^4*(a +b*arctan(c*x))/d/(e*x^2+d)^2-1/8*b*c*(c^2*d-3*e)*arctan(x*e^(1/2)/d^(1/2) )/(c^2*d-e)^2/e^(3/2)/d^(1/2)
Time = 2.46 (sec) , antiderivative size = 158, normalized size of antiderivative = 1.22 \[ \int \frac {x^3 (a+b \arctan (c x))}{\left (d+e x^2\right )^3} \, dx=\frac {\frac {2 a d}{\left (d+e x^2\right )^2}+\frac {-4 a c^2 d+4 a e+b c e x}{\left (c^2 d-e\right ) \left (d+e x^2\right )}+\frac {2 b c^2 \left (c^2 d-2 e\right ) \arctan (c x)}{\left (-c^2 d+e\right )^2}-\frac {2 b \left (d+2 e x^2\right ) \arctan (c x)}{\left (d+e x^2\right )^2}-\frac {b c \left (c^2 d-3 e\right ) \sqrt {e} \arctan \left (\frac {\sqrt {e} x}{\sqrt {d}}\right )}{\sqrt {d} \left (-c^2 d+e\right )^2}}{8 e^2} \]
((2*a*d)/(d + e*x^2)^2 + (-4*a*c^2*d + 4*a*e + b*c*e*x)/((c^2*d - e)*(d + e*x^2)) + (2*b*c^2*(c^2*d - 2*e)*ArcTan[c*x])/(-(c^2*d) + e)^2 - (2*b*(d + 2*e*x^2)*ArcTan[c*x])/(d + e*x^2)^2 - (b*c*(c^2*d - 3*e)*Sqrt[e]*ArcTan[( Sqrt[e]*x)/Sqrt[d]])/(Sqrt[d]*(-(c^2*d) + e)^2))/(8*e^2)
Time = 0.33 (sec) , antiderivative size = 151, normalized size of antiderivative = 1.16, number of steps used = 6, number of rules used = 6, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.286, Rules used = {5511, 27, 372, 397, 216, 218}
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.
| \(\displaystyle \int \frac {x^3 (a+b \arctan (c x))}{\left (d+e x^2\right )^3} \, dx\) |
| \(\Big \downarrow \) 5511 |
| \(\displaystyle \frac {x^4 (a+b \arctan (c x))}{4 d \left (d+e x^2\right )^2}-b c \int \frac {x^4}{4 d \left (c^2 x^2+1\right ) \left (e x^2+d\right )^2}dx\) |
| \(\Big \downarrow \) 27 |
| \(\displaystyle \frac {x^4 (a+b \arctan (c x))}{4 d \left (d+e x^2\right )^2}-\frac {b c \int \frac {x^4}{\left (c^2 x^2+1\right ) \left (e x^2+d\right )^2}dx}{4 d}\) |
| \(\Big \downarrow \) 372 |
| \(\displaystyle \frac {x^4 (a+b \arctan (c x))}{4 d \left (d+e x^2\right )^2}-\frac {b c \left (\frac {\int \frac {\left (c^2 d-2 e\right ) x^2+d}{\left (c^2 x^2+1\right ) \left (e x^2+d\right )}dx}{2 e \left (c^2 d-e\right )}-\frac {d x}{2 e \left (c^2 d-e\right ) \left (d+e x^2\right )}\right )}{4 d}\) |
| \(\Big \downarrow \) 397 |
| \(\displaystyle \frac {x^4 (a+b \arctan (c x))}{4 d \left (d+e x^2\right )^2}-\frac {b c \left (\frac {\frac {2 e \int \frac {1}{c^2 x^2+1}dx}{c^2 d-e}+\frac {d \left (c^2 d-3 e\right ) \int \frac {1}{e x^2+d}dx}{c^2 d-e}}{2 e \left (c^2 d-e\right )}-\frac {d x}{2 e \left (c^2 d-e\right ) \left (d+e x^2\right )}\right )}{4 d}\) |
| \(\Big \downarrow \) 216 |
| \(\displaystyle \frac {x^4 (a+b \arctan (c x))}{4 d \left (d+e x^2\right )^2}-\frac {b c \left (\frac {\frac {d \left (c^2 d-3 e\right ) \int \frac {1}{e x^2+d}dx}{c^2 d-e}+\frac {2 e \arctan (c x)}{c \left (c^2 d-e\right )}}{2 e \left (c^2 d-e\right )}-\frac {d x}{2 e \left (c^2 d-e\right ) \left (d+e x^2\right )}\right )}{4 d}\) |
| \(\Big \downarrow \) 218 |
| \(\displaystyle \frac {x^4 (a+b \arctan (c x))}{4 d \left (d+e x^2\right )^2}-\frac {b c \left (\frac {\frac {2 e \arctan (c x)}{c \left (c^2 d-e\right )}+\frac {\sqrt {d} \left (c^2 d-3 e\right ) \arctan \left (\frac {\sqrt {e} x}{\sqrt {d}}\right )}{\sqrt {e} \left (c^2 d-e\right )}}{2 e \left (c^2 d-e\right )}-\frac {d x}{2 e \left (c^2 d-e\right ) \left (d+e x^2\right )}\right )}{4 d}\) |
(x^4*(a + b*ArcTan[c*x]))/(4*d*(d + e*x^2)^2) - (b*c*(-1/2*(d*x)/((c^2*d - e)*e*(d + e*x^2)) + ((2*e*ArcTan[c*x])/(c*(c^2*d - e)) + (Sqrt[d]*(c^2*d - 3*e)*ArcTan[(Sqrt[e]*x)/Sqrt[d]])/((c^2*d - e)*Sqrt[e]))/(2*(c^2*d - e)* e)))/(4*d)
3.12.66.3.1 Defintions of rubi rules used
Int[(a_)*(Fx_), x_Symbol] :> Simp[a Int[Fx, x], x] /; FreeQ[a, x] && !Ma tchQ[Fx, (b_)*(Gx_) /; FreeQ[b, x]]
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[((a_) + (b_.)*(x_)^2)^(-1), x_Symbol] :> Simp[(Rt[a/b, 2]/a)*ArcTan[x/R t[a/b, 2]], x] /; FreeQ[{a, b}, x] && PosQ[a/b]
Int[((e_.)*(x_))^(m_.)*((a_) + (b_.)*(x_)^2)^(p_)*((c_) + (d_.)*(x_)^2)^(q_ ), x_Symbol] :> Simp[(-a)*e^3*(e*x)^(m - 3)*(a + b*x^2)^(p + 1)*((c + d*x^2 )^(q + 1)/(2*b*(b*c - a*d)*(p + 1))), x] + Simp[e^4/(2*b*(b*c - a*d)*(p + 1 )) Int[(e*x)^(m - 4)*(a + b*x^2)^(p + 1)*(c + d*x^2)^q*Simp[a*c*(m - 3) + (a*d*(m + 2*q - 1) + 2*b*c*(p + 1))*x^2, x], x], x] /; FreeQ[{a, b, c, d, e, q}, x] && NeQ[b*c - a*d, 0] && LtQ[p, -1] && GtQ[m, 3] && IntBinomialQ[a , b, c, d, e, m, 2, p, q, x]
Int[((e_) + (f_.)*(x_)^2)/(((a_) + (b_.)*(x_)^2)*((c_) + (d_.)*(x_)^2)), x_ Symbol] :> Simp[(b*e - a*f)/(b*c - a*d) Int[1/(a + b*x^2), x], x] - Simp[ (d*e - c*f)/(b*c - a*d) Int[1/(c + d*x^2), x], x] /; FreeQ[{a, b, c, d, e , f}, x]
Int[((a_.) + ArcTan[(c_.)*(x_)]*(b_.))*((f_.)*(x_))^(m_.)*((d_.) + (e_.)*(x _)^2)^(q_.), x_Symbol] :> With[{u = IntHide[(f*x)^m*(d + e*x^2)^q, x]}, Sim p[(a + b*ArcTan[c*x]) u, x] - Simp[b*c Int[SimplifyIntegrand[u/(1 + c^2 *x^2), x], x], x]] /; FreeQ[{a, b, c, d, e, f, m, q}, x] && ((IGtQ[q, 0] && !(ILtQ[(m - 1)/2, 0] && GtQ[m + 2*q + 3, 0])) || (IGtQ[(m + 1)/2, 0] && !(ILtQ[q, 0] && GtQ[m + 2*q + 3, 0])) || (ILtQ[(m + 2*q + 1)/2, 0] && !ILt Q[(m - 1)/2, 0]))
Time = 1.12 (sec) , antiderivative size = 211, normalized size of antiderivative = 1.62
| method | result | size |
| parts | \(a \left (\frac {d}{4 e^{2} \left (e \,x^{2}+d \right )^{2}}-\frac {1}{2 e^{2} \left (e \,x^{2}+d \right )}\right )+\frac {b \left (\frac {\arctan \left (c x \right ) c^{8} d}{4 e^{2} \left (e \,c^{2} x^{2}+c^{2} d \right )^{2}}-\frac {\arctan \left (c x \right ) c^{6}}{2 e^{2} \left (e \,c^{2} x^{2}+c^{2} d \right )}-\frac {c^{6} \left (\frac {e^{2} \left (-\frac {\left (c^{2} d -e \right ) c x}{2 e \left (e \,c^{2} x^{2}+c^{2} d \right )}+\frac {\left (c^{2} d -3 e \right ) \arctan \left (\frac {e x}{\sqrt {e d}}\right )}{2 e c \sqrt {e d}}\right )}{\left (c^{2} d -e \right )^{2}}+\frac {\left (-c^{2} d +2 e \right ) \arctan \left (c x \right )}{\left (c^{2} d -e \right )^{2}}\right )}{4 e^{2}}\right )}{c^{4}}\) | \(211\) |
| derivativedivides | \(\frac {a \,c^{6} \left (-\frac {1}{2 e^{2} \left (e \,c^{2} x^{2}+c^{2} d \right )}+\frac {d \,c^{2}}{4 e^{2} \left (e \,c^{2} x^{2}+c^{2} d \right )^{2}}\right )+b \,c^{6} \left (-\frac {\arctan \left (c x \right )}{2 e^{2} \left (e \,c^{2} x^{2}+c^{2} d \right )}+\frac {\arctan \left (c x \right ) d \,c^{2}}{4 e^{2} \left (e \,c^{2} x^{2}+c^{2} d \right )^{2}}-\frac {\frac {e^{2} \left (-\frac {\left (c^{2} d -e \right ) c x}{2 e \left (e \,c^{2} x^{2}+c^{2} d \right )}+\frac {\left (c^{2} d -3 e \right ) \arctan \left (\frac {e x}{\sqrt {e d}}\right )}{2 e c \sqrt {e d}}\right )}{\left (c^{2} d -e \right )^{2}}+\frac {\left (-c^{2} d +2 e \right ) \arctan \left (c x \right )}{\left (c^{2} d -e \right )^{2}}}{4 e^{2}}\right )}{c^{4}}\) | \(229\) |
| default | \(\frac {a \,c^{6} \left (-\frac {1}{2 e^{2} \left (e \,c^{2} x^{2}+c^{2} d \right )}+\frac {d \,c^{2}}{4 e^{2} \left (e \,c^{2} x^{2}+c^{2} d \right )^{2}}\right )+b \,c^{6} \left (-\frac {\arctan \left (c x \right )}{2 e^{2} \left (e \,c^{2} x^{2}+c^{2} d \right )}+\frac {\arctan \left (c x \right ) d \,c^{2}}{4 e^{2} \left (e \,c^{2} x^{2}+c^{2} d \right )^{2}}-\frac {\frac {e^{2} \left (-\frac {\left (c^{2} d -e \right ) c x}{2 e \left (e \,c^{2} x^{2}+c^{2} d \right )}+\frac {\left (c^{2} d -3 e \right ) \arctan \left (\frac {e x}{\sqrt {e d}}\right )}{2 e c \sqrt {e d}}\right )}{\left (c^{2} d -e \right )^{2}}+\frac {\left (-c^{2} d +2 e \right ) \arctan \left (c x \right )}{\left (c^{2} d -e \right )^{2}}}{4 e^{2}}\right )}{c^{4}}\) | \(229\) |
| risch | \(\text {Expression too large to display}\) | \(1153\) |
a*(1/4*d/e^2/(e*x^2+d)^2-1/2/e^2/(e*x^2+d))+b/c^4*(1/4*arctan(c*x)*c^8*d/e ^2/(c^2*e*x^2+c^2*d)^2-1/2*arctan(c*x)*c^6/e^2/(c^2*e*x^2+c^2*d)-1/4*c^6/e ^2*(e^2/(c^2*d-e)^2*(-1/2*(c^2*d-e)/e*c*x/(c^2*e*x^2+c^2*d)+1/2*(c^2*d-3*e )/e/c/(e*d)^(1/2)*arctan(e*x/(e*d)^(1/2)))+(-c^2*d+2*e)/(c^2*d-e)^2*arctan (c*x)))
Leaf count of result is larger than twice the leaf count of optimal. 338 vs. \(2 (114) = 228\).
Time = 0.37 (sec) , antiderivative size = 697, normalized size of antiderivative = 5.36 \[ \int \frac {x^3 (a+b \arctan (c x))}{\left (d+e x^2\right )^3} \, dx=\left [-\frac {4 \, a c^{4} d^{4} - 8 \, a c^{2} d^{3} e + 4 \, a d^{2} e^{2} - 2 \, {\left (b c^{3} d^{2} e^{2} - b c d e^{3}\right )} x^{3} + 8 \, {\left (a c^{4} d^{3} e - 2 \, a c^{2} d^{2} e^{2} + a d e^{3}\right )} x^{2} - {\left (b c^{3} d^{3} - 3 \, b c d^{2} e + {\left (b c^{3} d e^{2} - 3 \, b c e^{3}\right )} x^{4} + 2 \, {\left (b c^{3} d^{2} e - 3 \, b c d e^{2}\right )} x^{2}\right )} \sqrt {-d e} \log \left (\frac {e x^{2} - 2 \, \sqrt {-d e} x - d}{e x^{2} + d}\right ) - 2 \, {\left (b c^{3} d^{3} e - b c d^{2} e^{2}\right )} x + 4 \, {\left (2 \, b d e^{3} x^{2} + b d^{2} e^{2} - {\left (b c^{4} d^{2} e^{2} - 2 \, b c^{2} d e^{3}\right )} x^{4}\right )} \arctan \left (c x\right )}{16 \, {\left (c^{4} d^{5} e^{2} - 2 \, c^{2} d^{4} e^{3} + d^{3} e^{4} + {\left (c^{4} d^{3} e^{4} - 2 \, c^{2} d^{2} e^{5} + d e^{6}\right )} x^{4} + 2 \, {\left (c^{4} d^{4} e^{3} - 2 \, c^{2} d^{3} e^{4} + d^{2} e^{5}\right )} x^{2}\right )}}, -\frac {2 \, a c^{4} d^{4} - 4 \, a c^{2} d^{3} e + 2 \, a d^{2} e^{2} - {\left (b c^{3} d^{2} e^{2} - b c d e^{3}\right )} x^{3} + 4 \, {\left (a c^{4} d^{3} e - 2 \, a c^{2} d^{2} e^{2} + a d e^{3}\right )} x^{2} + {\left (b c^{3} d^{3} - 3 \, b c d^{2} e + {\left (b c^{3} d e^{2} - 3 \, b c e^{3}\right )} x^{4} + 2 \, {\left (b c^{3} d^{2} e - 3 \, b c d e^{2}\right )} x^{2}\right )} \sqrt {d e} \arctan \left (\frac {\sqrt {d e} x}{d}\right ) - {\left (b c^{3} d^{3} e - b c d^{2} e^{2}\right )} x + 2 \, {\left (2 \, b d e^{3} x^{2} + b d^{2} e^{2} - {\left (b c^{4} d^{2} e^{2} - 2 \, b c^{2} d e^{3}\right )} x^{4}\right )} \arctan \left (c x\right )}{8 \, {\left (c^{4} d^{5} e^{2} - 2 \, c^{2} d^{4} e^{3} + d^{3} e^{4} + {\left (c^{4} d^{3} e^{4} - 2 \, c^{2} d^{2} e^{5} + d e^{6}\right )} x^{4} + 2 \, {\left (c^{4} d^{4} e^{3} - 2 \, c^{2} d^{3} e^{4} + d^{2} e^{5}\right )} x^{2}\right )}}\right ] \]
[-1/16*(4*a*c^4*d^4 - 8*a*c^2*d^3*e + 4*a*d^2*e^2 - 2*(b*c^3*d^2*e^2 - b*c *d*e^3)*x^3 + 8*(a*c^4*d^3*e - 2*a*c^2*d^2*e^2 + a*d*e^3)*x^2 - (b*c^3*d^3 - 3*b*c*d^2*e + (b*c^3*d*e^2 - 3*b*c*e^3)*x^4 + 2*(b*c^3*d^2*e - 3*b*c*d* e^2)*x^2)*sqrt(-d*e)*log((e*x^2 - 2*sqrt(-d*e)*x - d)/(e*x^2 + d)) - 2*(b* c^3*d^3*e - b*c*d^2*e^2)*x + 4*(2*b*d*e^3*x^2 + b*d^2*e^2 - (b*c^4*d^2*e^2 - 2*b*c^2*d*e^3)*x^4)*arctan(c*x))/(c^4*d^5*e^2 - 2*c^2*d^4*e^3 + d^3*e^4 + (c^4*d^3*e^4 - 2*c^2*d^2*e^5 + d*e^6)*x^4 + 2*(c^4*d^4*e^3 - 2*c^2*d^3* e^4 + d^2*e^5)*x^2), -1/8*(2*a*c^4*d^4 - 4*a*c^2*d^3*e + 2*a*d^2*e^2 - (b* c^3*d^2*e^2 - b*c*d*e^3)*x^3 + 4*(a*c^4*d^3*e - 2*a*c^2*d^2*e^2 + a*d*e^3) *x^2 + (b*c^3*d^3 - 3*b*c*d^2*e + (b*c^3*d*e^2 - 3*b*c*e^3)*x^4 + 2*(b*c^3 *d^2*e - 3*b*c*d*e^2)*x^2)*sqrt(d*e)*arctan(sqrt(d*e)*x/d) - (b*c^3*d^3*e - b*c*d^2*e^2)*x + 2*(2*b*d*e^3*x^2 + b*d^2*e^2 - (b*c^4*d^2*e^2 - 2*b*c^2 *d*e^3)*x^4)*arctan(c*x))/(c^4*d^5*e^2 - 2*c^2*d^4*e^3 + d^3*e^4 + (c^4*d^ 3*e^4 - 2*c^2*d^2*e^5 + d*e^6)*x^4 + 2*(c^4*d^4*e^3 - 2*c^2*d^3*e^4 + d^2* e^5)*x^2)]
Timed out. \[ \int \frac {x^3 (a+b \arctan (c x))}{\left (d+e x^2\right )^3} \, dx=\text {Timed out} \]
Exception generated. \[ \int \frac {x^3 (a+b \arctan (c x))}{\left (d+e x^2\right )^3} \, dx=\text {Exception raised: ValueError} \]
Exception raised: ValueError >> Computation failed since Maxima requested additional constraints; using the 'assume' command before evaluation *may* help (example of legal syntax is 'assume(e>0)', see `assume?` for more de tails)Is e
\[ \int \frac {x^3 (a+b \arctan (c x))}{\left (d+e x^2\right )^3} \, dx=\int { \frac {{\left (b \arctan \left (c x\right ) + a\right )} x^{3}}{{\left (e x^{2} + d\right )}^{3}} \,d x } \]
Time = 3.71 (sec) , antiderivative size = 273, normalized size of antiderivative = 2.10 \[ \int \frac {x^3 (a+b \arctan (c x))}{\left (d+e x^2\right )^3} \, dx=\frac {b\,c^4\,d\,\mathrm {atan}\left (c\,x\right )}{4\,e^2\,{\left (e-c^2\,d\right )}^2}-\frac {a\,d}{4\,e^2\,{\left (e\,x^2+d\right )}^2}-\frac {b\,d\,\mathrm {atan}\left (c\,x\right )}{4\,e^2\,{\left (e\,x^2+d\right )}^2}-\frac {b\,c\,x^3}{8\,\left (e-c^2\,d\right )\,{\left (e\,x^2+d\right )}^2}-\frac {b\,c^2\,\mathrm {atan}\left (c\,x\right )}{2\,e\,{\left (e-c^2\,d\right )}^2}-\frac {b\,x^2\,\mathrm {atan}\left (c\,x\right )}{2\,e\,{\left (e\,x^2+d\right )}^2}-\frac {b\,c^3\,\mathrm {atan}\left (\frac {x\,\sqrt {-d\,e^3}\,1{}\mathrm {i}}{d\,e}\right )\,\sqrt {-d\,e^3}\,1{}\mathrm {i}}{8\,e^3\,{\left (e-c^2\,d\right )}^2}-\frac {a\,x^2}{2\,e\,{\left (e\,x^2+d\right )}^2}-\frac {b\,c\,d\,x}{8\,e\,\left (e-c^2\,d\right )\,{\left (e\,x^2+d\right )}^2}+\frac {b\,c\,\mathrm {atan}\left (\frac {x\,\sqrt {-d\,e^3}\,1{}\mathrm {i}}{d\,e}\right )\,\sqrt {-d\,e^3}\,3{}\mathrm {i}}{8\,d\,e^2\,{\left (e-c^2\,d\right )}^2} \]
(b*c^4*d*atan(c*x))/(4*e^2*(e - c^2*d)^2) - (a*d)/(4*e^2*(d + e*x^2)^2) - (b*d*atan(c*x))/(4*e^2*(d + e*x^2)^2) - (b*c*x^3)/(8*(e - c^2*d)*(d + e*x^ 2)^2) - (b*c^2*atan(c*x))/(2*e*(e - c^2*d)^2) - (b*x^2*atan(c*x))/(2*e*(d + e*x^2)^2) - (b*c^3*atan((x*(-d*e^3)^(1/2)*1i)/(d*e))*(-d*e^3)^(1/2)*1i)/ (8*e^3*(e - c^2*d)^2) - (a*x^2)/(2*e*(d + e*x^2)^2) - (b*c*d*x)/(8*e*(e - c^2*d)*(d + e*x^2)^2) + (b*c*atan((x*(-d*e^3)^(1/2)*1i)/(d*e))*(-d*e^3)^(1 /2)*3i)/(8*d*e^2*(e - c^2*d)^2)