Optimal. Leaf size=126 \[ -\frac {3 \text {erf}(b x)^2}{16 b^4}+\frac {x^3 e^{-b^2 x^2} \text {erf}(b x)}{2 \sqrt {\pi } b}+\frac {x^2 e^{-2 b^2 x^2}}{4 \pi b^2}+\frac {e^{-2 b^2 x^2}}{2 \pi b^4}+\frac {3 x e^{-b^2 x^2} \text {erf}(b x)}{4 \sqrt {\pi } b^3}+\frac {1}{4} x^4 \text {erf}(b x)^2 \]
[Out]
________________________________________________________________________________________
Rubi [A] time = 0.18, antiderivative size = 126, normalized size of antiderivative = 1.00, number of steps used = 8, number of rules used = 6, integrand size = 10, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.600, Rules used = {6364, 6385, 6373, 30, 2209, 2212} \[ \frac {x^3 e^{-b^2 x^2} \text {Erf}(b x)}{2 \sqrt {\pi } b}+\frac {3 x e^{-b^2 x^2} \text {Erf}(b x)}{4 \sqrt {\pi } b^3}-\frac {3 \text {Erf}(b x)^2}{16 b^4}+\frac {x^2 e^{-2 b^2 x^2}}{4 \pi b^2}+\frac {e^{-2 b^2 x^2}}{2 \pi b^4}+\frac {1}{4} x^4 \text {Erf}(b x)^2 \]
Antiderivative was successfully verified.
[In]
[Out]
Rule 30
Rule 2209
Rule 2212
Rule 6364
Rule 6373
Rule 6385
Rubi steps
\begin {align*} \int x^3 \text {erf}(b x)^2 \, dx &=\frac {1}{4} x^4 \text {erf}(b x)^2-\frac {b \int e^{-b^2 x^2} x^4 \text {erf}(b x) \, dx}{\sqrt {\pi }}\\ &=\frac {e^{-b^2 x^2} x^3 \text {erf}(b x)}{2 b \sqrt {\pi }}+\frac {1}{4} x^4 \text {erf}(b x)^2-\frac {\int e^{-2 b^2 x^2} x^3 \, dx}{\pi }-\frac {3 \int e^{-b^2 x^2} x^2 \text {erf}(b x) \, dx}{2 b \sqrt {\pi }}\\ &=\frac {e^{-2 b^2 x^2} x^2}{4 b^2 \pi }+\frac {3 e^{-b^2 x^2} x \text {erf}(b x)}{4 b^3 \sqrt {\pi }}+\frac {e^{-b^2 x^2} x^3 \text {erf}(b x)}{2 b \sqrt {\pi }}+\frac {1}{4} x^4 \text {erf}(b x)^2-\frac {\int e^{-2 b^2 x^2} x \, dx}{2 b^2 \pi }-\frac {3 \int e^{-2 b^2 x^2} x \, dx}{2 b^2 \pi }-\frac {3 \int e^{-b^2 x^2} \text {erf}(b x) \, dx}{4 b^3 \sqrt {\pi }}\\ &=\frac {e^{-2 b^2 x^2}}{2 b^4 \pi }+\frac {e^{-2 b^2 x^2} x^2}{4 b^2 \pi }+\frac {3 e^{-b^2 x^2} x \text {erf}(b x)}{4 b^3 \sqrt {\pi }}+\frac {e^{-b^2 x^2} x^3 \text {erf}(b x)}{2 b \sqrt {\pi }}+\frac {1}{4} x^4 \text {erf}(b x)^2-\frac {3 \operatorname {Subst}(\int x \, dx,x,\text {erf}(b x))}{8 b^4}\\ &=\frac {e^{-2 b^2 x^2}}{2 b^4 \pi }+\frac {e^{-2 b^2 x^2} x^2}{4 b^2 \pi }+\frac {3 e^{-b^2 x^2} x \text {erf}(b x)}{4 b^3 \sqrt {\pi }}+\frac {e^{-b^2 x^2} x^3 \text {erf}(b x)}{2 b \sqrt {\pi }}-\frac {3 \text {erf}(b x)^2}{16 b^4}+\frac {1}{4} x^4 \text {erf}(b x)^2\\ \end {align*}
________________________________________________________________________________________
Mathematica [A] time = 0.04, size = 90, normalized size = 0.71 \[ \frac {e^{-2 b^2 x^2} \left (4 \sqrt {\pi } b x e^{b^2 x^2} \left (2 b^2 x^2+3\right ) \text {erf}(b x)+4 b^2 x^2+\pi e^{2 b^2 x^2} \left (4 b^4 x^4-3\right ) \text {erf}(b x)^2+8\right )}{16 \pi b^4} \]
Antiderivative was successfully verified.
[In]
[Out]
________________________________________________________________________________________
fricas [A] time = 0.41, size = 81, normalized size = 0.64 \[ \frac {4 \, \sqrt {\pi } {\left (2 \, b^{3} x^{3} + 3 \, b x\right )} \operatorname {erf}\left (b x\right ) e^{\left (-b^{2} x^{2}\right )} - {\left (3 \, \pi - 4 \, \pi b^{4} x^{4}\right )} \operatorname {erf}\left (b x\right )^{2} + 4 \, {\left (b^{2} x^{2} + 2\right )} e^{\left (-2 \, b^{2} x^{2}\right )}}{16 \, \pi b^{4}} \]
Verification of antiderivative is not currently implemented for this CAS.
[In]
[Out]
________________________________________________________________________________________
giac [F] time = 0.00, size = 0, normalized size = 0.00 \[ \int x^{3} \operatorname {erf}\left (b x\right )^{2}\,{d x} \]
Verification of antiderivative is not currently implemented for this CAS.
[In]
[Out]
________________________________________________________________________________________
maple [F] time = 0.01, size = 0, normalized size = 0.00 \[ \int x^{3} \erf \left (b x \right )^{2}\, dx \]
Verification of antiderivative is not currently implemented for this CAS.
[In]
[Out]
________________________________________________________________________________________
maxima [F] time = 0.00, size = 0, normalized size = 0.00 \[ -\frac {-\frac {{\left (2 \, b^{2} x^{2} + 1\right )} e^{\left (-2 \, b^{2} x^{2}\right )}}{4 \, b^{2}} - \frac {3 \, e^{\left (-2 \, b^{2} x^{2}\right )}}{4 \, b^{2}}}{2 \, \pi b^{2}} - \frac {{\left (3 \, \pi - 4 \, \pi b^{4} x^{4}\right )} \operatorname {erf}\left (b x\right )^{2} - 4 \, {\left (2 \, \sqrt {\pi } b^{3} x^{3} + 3 \, \sqrt {\pi } b x\right )} \operatorname {erf}\left (b x\right ) e^{\left (-b^{2} x^{2}\right )}}{16 \, \pi b^{4}} \]
Verification of antiderivative is not currently implemented for this CAS.
[In]
[Out]
________________________________________________________________________________________
mupad [B] time = 0.21, size = 101, normalized size = 0.80 \[ \frac {x^4\,{\mathrm {erf}\left (b\,x\right )}^2}{4}+\frac {\frac {{\mathrm {e}}^{-2\,b^2\,x^2}}{2}-\frac {3\,\pi \,{\mathrm {erf}\left (b\,x\right )}^2}{16}+\frac {b^2\,x^2\,{\mathrm {e}}^{-2\,b^2\,x^2}}{4}+\frac {b^3\,x^3\,\sqrt {\pi }\,{\mathrm {e}}^{-b^2\,x^2}\,\mathrm {erf}\left (b\,x\right )}{2}+\frac {3\,b\,x\,\sqrt {\pi }\,{\mathrm {e}}^{-b^2\,x^2}\,\mathrm {erf}\left (b\,x\right )}{4}}{b^4\,\pi } \]
Verification of antiderivative is not currently implemented for this CAS.
[In]
[Out]
________________________________________________________________________________________
sympy [A] time = 1.97, size = 117, normalized size = 0.93 \[ \begin {cases} \frac {x^{4} \operatorname {erf}^{2}{\left (b x \right )}}{4} + \frac {x^{3} e^{- b^{2} x^{2}} \operatorname {erf}{\left (b x \right )}}{2 \sqrt {\pi } b} + \frac {x^{2} e^{- 2 b^{2} x^{2}}}{4 \pi b^{2}} + \frac {3 x e^{- b^{2} x^{2}} \operatorname {erf}{\left (b x \right )}}{4 \sqrt {\pi } b^{3}} - \frac {3 \operatorname {erf}^{2}{\left (b x \right )}}{16 b^{4}} + \frac {e^{- 2 b^{2} x^{2}}}{2 \pi b^{4}} & \text {for}\: b \neq 0 \\0 & \text {otherwise} \end {cases} \]
Verification of antiderivative is not currently implemented for this CAS.
[In]
[Out]
________________________________________________________________________________________