Optimal. Leaf size=71 \[ \frac {1}{3} b^4 \text {erf}(b x)-\frac {b e^{-b^2 x^2}}{6 \sqrt {\pi } x^3}+\frac {b^3 e^{-b^2 x^2}}{3 \sqrt {\pi } x}-\frac {\text {erf}(b x)}{4 x^4} \]
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Rubi [A] time = 0.07, antiderivative size = 71, normalized size of antiderivative = 1.00, 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.
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Rule 2205
Rule 2214
Rule 6361
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*}
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Mathematica [A] time = 0.02, 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.
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fricas [A] time = 0.41, size = 55, normalized size = 0.77 \[ \frac {2 \, \sqrt {\pi } {\left (2 \, b^{3} x^{3} - b x\right )} e^{\left (-b^{2} x^{2}\right )} - {\left (3 \, \pi - 4 \, \pi b^{4} x^{4}\right )} \operatorname {erf}\left (b x\right )}{12 \, \pi x^{4}} \]
Verification of antiderivative is not currently implemented for this CAS.
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giac [F] time = 0.00, size = 0, normalized size = 0.00 \[ \int \frac {\operatorname {erf}\left (b x\right )}{x^{5}}\,{d x} \]
Verification of antiderivative is not currently implemented for this CAS.
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maple [A] time = 0.01, size = 69, normalized size = 0.97 \[ b^{4} \left (-\frac {\erf \left (b x \right )}{4 b^{4} x^{4}}+\frac {-\frac {{\mathrm e}^{-b^{2} x^{2}}}{3 b^{3} x^{3}}+\frac {2 \,{\mathrm e}^{-b^{2} x^{2}}}{3 b x}+\frac {2 \sqrt {\pi }\, \erf \left (b x \right )}{3}}{2 \sqrt {\pi }}\right ) \]
Verification of antiderivative is not currently implemented for this CAS.
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maxima [A] time = 0.46, size = 35, normalized size = 0.49 \[ -\frac {b^{4} {\left (x^{2}\right )}^{\frac {3}{2}} \Gamma \left (-\frac {3}{2}, b^{2} x^{2}\right )}{4 \, \sqrt {\pi } x^{3}} - \frac {\operatorname {erf}\left (b x\right )}{4 \, x^{4}} \]
Verification of antiderivative is not currently implemented for this CAS.
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mupad [B] time = 0.11, size = 88, normalized size = 1.24 \[ \frac {b\,{\left (b^2\,x^2\right )}^{3/2}}{3\,x^3}-\frac {\mathrm {erf}\left (b\,x\right )}{4\,x^4}+\frac {b^3\,{\mathrm {e}}^{-b^2\,x^2}}{3\,x\,\sqrt {\pi }}-\frac {b\,{\mathrm {e}}^{-b^2\,x^2}}{6\,x^3\,\sqrt {\pi }}-\frac {b\,\mathrm {erfc}\left (\sqrt {b^2\,x^2}\right )\,{\left (b^2\,x^2\right )}^{3/2}}{3\,x^3} \]
Verification of antiderivative is not currently implemented for this CAS.
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sympy [A] time = 1.15, size = 60, normalized size = 0.85 \[ \frac {b^{4} \operatorname {erf}{\left (b x \right )}}{3} + \frac {b^{3} e^{- b^{2} x^{2}}}{3 \sqrt {\pi } x} - \frac {b e^{- b^{2} x^{2}}}{6 \sqrt {\pi } x^{3}} - \frac {\operatorname {erf}{\left (b x \right )}}{4 x^{4}} \]
Verification of antiderivative is not currently implemented for this CAS.
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