Optimal. Leaf size=54 \[ -\frac {b e^{b^2 x^2}}{3 \sqrt {\pi } x^2}+\frac {b^3 \text {Ei}\left (b^2 x^2\right )}{3 \sqrt {\pi }}-\frac {\text {erfi}(b x)}{3 x^3} \]
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Rubi [A] time = 0.05, antiderivative size = 54, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 3, integrand size = 8, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.375, Rules used = {6363, 2214, 2210} \[ \frac {b^3 \text {Ei}\left (b^2 x^2\right )}{3 \sqrt {\pi }}-\frac {b e^{b^2 x^2}}{3 \sqrt {\pi } x^2}-\frac {\text {Erfi}(b x)}{3 x^3} \]
Antiderivative was successfully verified.
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Rule 2210
Rule 2214
Rule 6363
Rubi steps
\begin {align*} \int \frac {\text {erfi}(b x)}{x^4} \, dx &=-\frac {\text {erfi}(b x)}{3 x^3}+\frac {(2 b) \int \frac {e^{b^2 x^2}}{x^3} \, dx}{3 \sqrt {\pi }}\\ &=-\frac {b e^{b^2 x^2}}{3 \sqrt {\pi } x^2}-\frac {\text {erfi}(b x)}{3 x^3}+\frac {\left (2 b^3\right ) \int \frac {e^{b^2 x^2}}{x} \, dx}{3 \sqrt {\pi }}\\ &=-\frac {b e^{b^2 x^2}}{3 \sqrt {\pi } x^2}-\frac {\text {erfi}(b x)}{3 x^3}+\frac {b^3 \text {Ei}\left (b^2 x^2\right )}{3 \sqrt {\pi }}\\ \end {align*}
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Mathematica [A] time = 0.02, size = 50, normalized size = 0.93 \[ -\frac {\frac {b x e^{b^2 x^2}}{\sqrt {\pi }}-\frac {b^3 x^3 \text {Ei}\left (b^2 x^2\right )}{\sqrt {\pi }}+\text {erfi}(b x)}{3 x^3} \]
Antiderivative was successfully verified.
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fricas [A] time = 0.44, size = 48, normalized size = 0.89 \[ -\frac {\pi \operatorname {erfi}\left (b x\right ) - \sqrt {\pi } {\left (b^{3} x^{3} {\rm Ei}\left (b^{2} x^{2}\right ) - b x e^{\left (b^{2} x^{2}\right )}\right )}}{3 \, \pi x^{3}} \]
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 \[ \int \frac {\operatorname {erfi}\left (b x\right )}{x^{4}}\,{d x} \]
Verification of antiderivative is not currently implemented for this CAS.
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maple [A] time = 0.01, size = 52, normalized size = 0.96 \[ b^{3} \left (-\frac {\erfi \left (b x \right )}{3 b^{3} x^{3}}+\frac {-\frac {{\mathrm e}^{b^{2} x^{2}}}{3 b^{2} x^{2}}-\frac {\Ei \left (1, -b^{2} x^{2}\right )}{3}}{\sqrt {\pi }}\right ) \]
Verification of antiderivative is not currently implemented for this CAS.
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maxima [A] time = 0.38, size = 28, normalized size = 0.52 \[ \frac {b^{3} \Gamma \left (-1, -b^{2} x^{2}\right )}{3 \, \sqrt {\pi }} - \frac {\operatorname {erfi}\left (b x\right )}{3 \, x^{3}} \]
Verification of antiderivative is not currently implemented for this CAS.
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mupad [B] time = 0.22, size = 43, normalized size = 0.80 \[ \frac {b^3\,\mathrm {ei}\left (b^2\,x^2\right )}{3\,\sqrt {\pi }}-\frac {\mathrm {erfi}\left (b\,x\right )}{3\,x^3}-\frac {b\,{\mathrm {e}}^{b^2\,x^2}}{3\,x^2\,\sqrt {\pi }} \]
Verification of antiderivative is not currently implemented for this CAS.
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sympy [C] time = 1.67, size = 63, normalized size = 1.17 \[ - \frac {b^{3} \operatorname {E}_{1}\left (b^{2} x^{2} e^{i \pi }\right )}{3 \sqrt {\pi }} - \frac {b e^{b^{2} x^{2}}}{3 \sqrt {\pi } x^{2}} - \frac {i \operatorname {erfc}{\left (i b x \right )}}{3 x^{3}} + \frac {i}{3 x^{3}} \]
Verification of antiderivative is not currently implemented for this CAS.
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