Optimal. Leaf size=125 \[ \frac {1}{3} b^4 \text {erf}(b x)^2-\frac {b e^{-b^2 x^2} \text {erf}(b x)}{3 \sqrt {\pi } x^3}-\frac {b^2 e^{-2 b^2 x^2}}{3 \pi x^2}-\frac {4 b^4 \text {Ei}\left (-2 b^2 x^2\right )}{3 \pi }+\frac {2 b^3 e^{-b^2 x^2} \text {erf}(b x)}{3 \sqrt {\pi } x}-\frac {\text {erf}(b x)^2}{4 x^4} \]
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Rubi [A] time = 0.18, antiderivative size = 125, 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, 6391, 6373, 30, 2210, 2214} \[ \frac {2 b^3 e^{-b^2 x^2} \text {Erf}(b x)}{3 \sqrt {\pi } x}-\frac {b e^{-b^2 x^2} \text {Erf}(b x)}{3 \sqrt {\pi } x^3}+\frac {1}{3} b^4 \text {Erf}(b x)^2-\frac {4 b^4 \text {Ei}\left (-2 b^2 x^2\right )}{3 \pi }-\frac {b^2 e^{-2 b^2 x^2}}{3 \pi x^2}-\frac {\text {Erf}(b x)^2}{4 x^4} \]
Antiderivative was successfully verified.
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Rule 30
Rule 2210
Rule 2214
Rule 6364
Rule 6373
Rule 6391
Rubi steps
\begin {align*} \int \frac {\text {erf}(b x)^2}{x^5} \, dx &=-\frac {\text {erf}(b x)^2}{4 x^4}+\frac {b \int \frac {e^{-b^2 x^2} \text {erf}(b x)}{x^4} \, dx}{\sqrt {\pi }}\\ &=-\frac {b e^{-b^2 x^2} \text {erf}(b x)}{3 \sqrt {\pi } x^3}-\frac {\text {erf}(b x)^2}{4 x^4}+\frac {\left (2 b^2\right ) \int \frac {e^{-2 b^2 x^2}}{x^3} \, dx}{3 \pi }-\frac {\left (2 b^3\right ) \int \frac {e^{-b^2 x^2} \text {erf}(b x)}{x^2} \, dx}{3 \sqrt {\pi }}\\ &=-\frac {b^2 e^{-2 b^2 x^2}}{3 \pi x^2}-\frac {b e^{-b^2 x^2} \text {erf}(b x)}{3 \sqrt {\pi } x^3}+\frac {2 b^3 e^{-b^2 x^2} \text {erf}(b x)}{3 \sqrt {\pi } x}-\frac {\text {erf}(b x)^2}{4 x^4}-2 \frac {\left (4 b^4\right ) \int \frac {e^{-2 b^2 x^2}}{x} \, dx}{3 \pi }+\frac {\left (4 b^5\right ) \int e^{-b^2 x^2} \text {erf}(b x) \, dx}{3 \sqrt {\pi }}\\ &=-\frac {b^2 e^{-2 b^2 x^2}}{3 \pi x^2}-\frac {b e^{-b^2 x^2} \text {erf}(b x)}{3 \sqrt {\pi } x^3}+\frac {2 b^3 e^{-b^2 x^2} \text {erf}(b x)}{3 \sqrt {\pi } x}-\frac {\text {erf}(b x)^2}{4 x^4}-\frac {4 b^4 \text {Ei}\left (-2 b^2 x^2\right )}{3 \pi }+\frac {1}{3} \left (2 b^4\right ) \operatorname {Subst}(\int x \, dx,x,\text {erf}(b x))\\ &=-\frac {b^2 e^{-2 b^2 x^2}}{3 \pi x^2}-\frac {b e^{-b^2 x^2} \text {erf}(b x)}{3 \sqrt {\pi } x^3}+\frac {2 b^3 e^{-b^2 x^2} \text {erf}(b x)}{3 \sqrt {\pi } x}+\frac {1}{3} b^4 \text {erf}(b x)^2-\frac {\text {erf}(b x)^2}{4 x^4}-\frac {4 b^4 \text {Ei}\left (-2 b^2 x^2\right )}{3 \pi }\\ \end {align*}
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Mathematica [A] time = 0.09, size = 97, normalized size = 0.78 \[ \frac {\left (4 b^4 x^4-3\right ) \text {erf}(b x)^2+\frac {4 b x e^{-b^2 x^2} \left (2 b^2 x^2-1\right ) \text {erf}(b x)}{\sqrt {\pi }}-\frac {4 b^2 x^2 \left (4 b^2 x^2 \text {Ei}\left (-2 b^2 x^2\right )+e^{-2 b^2 x^2}\right )}{\pi }}{12 x^4} \]
Antiderivative was successfully verified.
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fricas [A] time = 0.53, size = 94, normalized size = 0.75 \[ -\frac {16 \, b^{4} x^{4} {\rm Ei}\left (-2 \, b^{2} x^{2}\right ) + 4 \, b^{2} x^{2} e^{\left (-2 \, b^{2} x^{2}\right )} - 4 \, \sqrt {\pi } {\left (2 \, b^{3} x^{3} - b x\right )} \operatorname {erf}\left (b x\right ) e^{\left (-b^{2} x^{2}\right )} + {\left (3 \, \pi - 4 \, \pi b^{4} x^{4}\right )} \operatorname {erf}\left (b x\right )^{2}}{12 \, \pi x^{4}} \]
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 \[ \int \frac {\operatorname {erf}\left (b x\right )^{2}}{x^{5}}\,{d x} \]
Verification of antiderivative is not currently implemented for this CAS.
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maple [F] time = 0.01, size = 0, normalized size = 0.00 \[ \int \frac {\erf \left (b x \right )^{2}}{x^{5}}\, dx \]
Verification of antiderivative is not currently implemented for this CAS.
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maxima [F] time = 0.00, size = 0, normalized size = 0.00 \[ \frac {b \int \frac {\operatorname {erf}\left (b x\right ) e^{\left (-b^{2} x^{2}\right )}}{x^{4}}\,{d x}}{\sqrt {\pi }} - \frac {\operatorname {erf}\left (b x\right )^{2}}{4 \, x^{4}} \]
Verification of antiderivative is not currently implemented for this CAS.
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mupad [F] time = 0.00, size = -1, normalized size = -0.01 \[ \int \frac {{\mathrm {erf}\left (b\,x\right )}^2}{x^5} \,d x \]
Verification of antiderivative is not currently implemented for this CAS.
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sympy [F] time = 0.00, size = 0, normalized size = 0.00 \[ \int \frac {\operatorname {erf}^{2}{\left (b x \right )}}{x^{5}}\, dx \]
Verification of antiderivative is not currently implemented for this CAS.
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