Integrand size = 10, antiderivative size = 123 \[ \int \frac {\text {erfi}(b x)^2}{x^5} \, dx=-\frac {b^2 e^{2 b^2 x^2}}{3 \pi x^2}-\frac {b e^{b^2 x^2} \text {erfi}(b x)}{3 \sqrt {\pi } x^3}-\frac {2 b^3 e^{b^2 x^2} \text {erfi}(b x)}{3 \sqrt {\pi } x}+\frac {1}{3} b^4 \text {erfi}(b x)^2-\frac {\text {erfi}(b x)^2}{4 x^4}+\frac {4 b^4 \operatorname {ExpIntegralEi}\left (2 b^2 x^2\right )}{3 \pi } \]
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Time = 0.11 (sec) , antiderivative size = 123, normalized size of antiderivative = 1.00, number of steps used = 8, number of rules used = 6, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.600, Rules used = {6501, 6528, 6510, 30, 2241, 2245} \[ \int \frac {\text {erfi}(b x)^2}{x^5} \, dx=\frac {1}{3} b^4 \text {erfi}(b x)^2-\frac {b e^{b^2 x^2} \text {erfi}(b x)}{3 \sqrt {\pi } x^3}-\frac {b^2 e^{2 b^2 x^2}}{3 \pi x^2}+\frac {4 b^4 \operatorname {ExpIntegralEi}\left (2 b^2 x^2\right )}{3 \pi }-\frac {2 b^3 e^{b^2 x^2} \text {erfi}(b x)}{3 \sqrt {\pi } x}-\frac {\text {erfi}(b x)^2}{4 x^4} \]
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Rule 30
Rule 2241
Rule 2245
Rule 6501
Rule 6510
Rule 6528
Rubi steps \begin{align*} \text {integral}& = -\frac {\text {erfi}(b x)^2}{4 x^4}+\frac {b \int \frac {e^{b^2 x^2} \text {erfi}(b x)}{x^4} \, dx}{\sqrt {\pi }} \\ & = -\frac {b e^{b^2 x^2} \text {erfi}(b x)}{3 \sqrt {\pi } x^3}-\frac {\text {erfi}(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 {erfi}(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 {erfi}(b x)}{3 \sqrt {\pi } x^3}-\frac {2 b^3 e^{b^2 x^2} \text {erfi}(b x)}{3 \sqrt {\pi } x}-\frac {\text {erfi}(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 {erfi}(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 {erfi}(b x)}{3 \sqrt {\pi } x^3}-\frac {2 b^3 e^{b^2 x^2} \text {erfi}(b x)}{3 \sqrt {\pi } x}-\frac {\text {erfi}(b x)^2}{4 x^4}+\frac {4 b^4 \operatorname {ExpIntegralEi}\left (2 b^2 x^2\right )}{3 \pi }+\frac {1}{3} \left (2 b^4\right ) \text {Subst}(\int x \, dx,x,\text {erfi}(b x)) \\ & = -\frac {b^2 e^{2 b^2 x^2}}{3 \pi x^2}-\frac {b e^{b^2 x^2} \text {erfi}(b x)}{3 \sqrt {\pi } x^3}-\frac {2 b^3 e^{b^2 x^2} \text {erfi}(b x)}{3 \sqrt {\pi } x}+\frac {1}{3} b^4 \text {erfi}(b x)^2-\frac {\text {erfi}(b x)^2}{4 x^4}+\frac {4 b^4 \operatorname {ExpIntegralEi}\left (2 b^2 x^2\right )}{3 \pi } \\ \end{align*}
Time = 0.02 (sec) , antiderivative size = 97, normalized size of antiderivative = 0.79 \[ \int \frac {\text {erfi}(b x)^2}{x^5} \, dx=\frac {-4 b e^{b^2 x^2} \sqrt {\pi } x \left (1+2 b^2 x^2\right ) \text {erfi}(b x)+\pi \left (-3+4 b^4 x^4\right ) \text {erfi}(b x)^2-4 b^2 x^2 \left (e^{2 b^2 x^2}-4 b^2 x^2 \operatorname {ExpIntegralEi}\left (2 b^2 x^2\right )\right )}{12 \pi x^4} \]
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\[\int \frac {\operatorname {erfi}\left (b x \right )^{2}}{x^{5}}d x\]
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none
Time = 0.25 (sec) , antiderivative size = 93, normalized size of antiderivative = 0.76 \[ \int \frac {\text {erfi}(b x)^2}{x^5} \, dx=\frac {16 \, b^{4} x^{4} {\rm Ei}\left (2 \, b^{2} x^{2}\right ) - 4 \, b^{2} x^{2} e^{\left (2 \, b^{2} x^{2}\right )} - 4 \, \sqrt {\pi } {\left (2 \, b^{3} x^{3} + b x\right )} \operatorname {erfi}\left (b x\right ) e^{\left (b^{2} x^{2}\right )} - {\left (3 \, \pi - 4 \, \pi b^{4} x^{4}\right )} \operatorname {erfi}\left (b x\right )^{2}}{12 \, \pi x^{4}} \]
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\[ \int \frac {\text {erfi}(b x)^2}{x^5} \, dx=\int \frac {\operatorname {erfi}^{2}{\left (b x \right )}}{x^{5}}\, dx \]
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\[ \int \frac {\text {erfi}(b x)^2}{x^5} \, dx=\int { \frac {\operatorname {erfi}\left (b x\right )^{2}}{x^{5}} \,d x } \]
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\[ \int \frac {\text {erfi}(b x)^2}{x^5} \, dx=\int { \frac {\operatorname {erfi}\left (b x\right )^{2}}{x^{5}} \,d x } \]
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Timed out. \[ \int \frac {\text {erfi}(b x)^2}{x^5} \, dx=\int \frac {{\mathrm {erfi}\left (b\,x\right )}^2}{x^5} \,d x \]
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