Optimal. Leaf size=71 \[ \frac{1}{3} b^4 \text{Erf}(b x)+\frac{b^3 e^{-b^2 x^2}}{3 \sqrt{\pi } x}-\frac{b e^{-b^2 x^2}}{6 \sqrt{\pi } x^3}-\frac{\text{Erf}(b x)}{4 x^4} \]
[Out]
________________________________________________________________________________________
Rubi [A] time = 0.0650876, antiderivative size = 71, normalized size of antiderivative = 1., number of steps used = 4, number of rules used = 3, integrand size = 8, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.375, Rules used = {6361, 2214, 2205} \[ \frac{1}{3} b^4 \text{Erf}(b x)+\frac{b^3 e^{-b^2 x^2}}{3 \sqrt{\pi } x}-\frac{b e^{-b^2 x^2}}{6 \sqrt{\pi } x^3}-\frac{\text{Erf}(b x)}{4 x^4} \]
Antiderivative was successfully verified.
[In]
[Out]
Rule 6361
Rule 2214
Rule 2205
Rubi steps
\begin{align*} \int \frac{\text{erf}(b x)}{x^5} \, dx &=-\frac{\text{erf}(b x)}{4 x^4}+\frac{b \int \frac{e^{-b^2 x^2}}{x^4} \, dx}{2 \sqrt{\pi }}\\ &=-\frac{b e^{-b^2 x^2}}{6 \sqrt{\pi } x^3}-\frac{\text{erf}(b x)}{4 x^4}-\frac{b^3 \int \frac{e^{-b^2 x^2}}{x^2} \, dx}{3 \sqrt{\pi }}\\ &=-\frac{b e^{-b^2 x^2}}{6 \sqrt{\pi } x^3}+\frac{b^3 e^{-b^2 x^2}}{3 \sqrt{\pi } x}-\frac{\text{erf}(b x)}{4 x^4}+\frac{\left (2 b^5\right ) \int e^{-b^2 x^2} \, dx}{3 \sqrt{\pi }}\\ &=-\frac{b e^{-b^2 x^2}}{6 \sqrt{\pi } x^3}+\frac{b^3 e^{-b^2 x^2}}{3 \sqrt{\pi } x}+\frac{1}{3} b^4 \text{erf}(b x)-\frac{\text{erf}(b x)}{4 x^4}\\ \end{align*}
Mathematica [A] time = 0.0174827, size = 63, normalized size = 0.89 \[ \frac{1}{3} b^4 \text{Erf}(b x)+e^{-b^2 x^2} \left (\frac{b^3}{3 \sqrt{\pi } x}-\frac{b}{6 \sqrt{\pi } x^3}\right )-\frac{\text{Erf}(b x)}{4 x^4} \]
Antiderivative was successfully verified.
[In]
[Out]
________________________________________________________________________________________
Maple [A] time = 0.046, size = 69, normalized size = 1. \begin{align*}{b}^{4} \left ( -{\frac{{\it Erf} \left ( bx \right ) }{4\,{b}^{4}{x}^{4}}}+{\frac{1}{2\,\sqrt{\pi }} \left ( -{\frac{1}{3\,{{\rm e}^{{b}^{2}{x}^{2}}}{b}^{3}{x}^{3}}}+{\frac{2}{3\,{{\rm e}^{{b}^{2}{x}^{2}}}bx}}+{\frac{2\,\sqrt{\pi }{\it Erf} \left ( bx \right ) }{3}} \right ) } \right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
[In]
[Out]
________________________________________________________________________________________
Maxima [A] time = 1.13255, size = 50, normalized size = 0.7 \begin{align*} -\frac{\left (b^{2} x^{2}\right )^{\frac{3}{2}} b \Gamma \left (-\frac{3}{2}, b^{2} x^{2}\right )}{4 \, \sqrt{\pi } x^{3}} - \frac{\operatorname{erf}\left (b x\right )}{4 \, x^{4}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
[In]
[Out]
________________________________________________________________________________________
Fricas [A] time = 2.5562, size = 124, normalized size = 1.75 \begin{align*} \frac{2 \, \sqrt{\pi }{\left (2 \, b^{3} x^{3} - 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 )}{12 \, \pi x^{4}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
[In]
[Out]
________________________________________________________________________________________
Sympy [A] time = 1.66474, size = 60, normalized size = 0.85 \begin{align*} \frac{b^{4} \operatorname{erf}{\left (b x \right )}}{3} + \frac{b^{3} e^{- b^{2} x^{2}}}{3 \sqrt{\pi } x} - \frac{b e^{- b^{2} x^{2}}}{6 \sqrt{\pi } x^{3}} - \frac{\operatorname{erf}{\left (b x \right )}}{4 x^{4}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
[In]
[Out]
________________________________________________________________________________________
Giac [F] time = 0., size = 0, normalized size = 0. \begin{align*} \int \frac{\operatorname{erf}\left (b x\right )}{x^{5}}\,{d x} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
[In]
[Out]