Integrand size = 8, antiderivative size = 26 \[ \int \frac {\text {erf}(b x)}{x^2} \, dx=-\frac {\text {erf}(b x)}{x}+\frac {b \operatorname {ExpIntegralEi}\left (-b^2 x^2\right )}{\sqrt {\pi }} \]
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Time = 0.02 (sec) , antiderivative size = 26, normalized size of antiderivative = 1.00, number of steps used = 2, number of rules used = 2, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.250, Rules used = {6496, 2241} \[ \int \frac {\text {erf}(b x)}{x^2} \, dx=\frac {b \operatorname {ExpIntegralEi}\left (-b^2 x^2\right )}{\sqrt {\pi }}-\frac {\text {erf}(b x)}{x} \]
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Rule 2241
Rule 6496
Rubi steps \begin{align*} \text {integral}& = -\frac {\text {erf}(b x)}{x}+\frac {(2 b) \int \frac {e^{-b^2 x^2}}{x} \, dx}{\sqrt {\pi }} \\ & = -\frac {\text {erf}(b x)}{x}+\frac {b \operatorname {ExpIntegralEi}\left (-b^2 x^2\right )}{\sqrt {\pi }} \\ \end{align*}
Time = 0.01 (sec) , antiderivative size = 26, normalized size of antiderivative = 1.00 \[ \int \frac {\text {erf}(b x)}{x^2} \, dx=-\frac {\text {erf}(b x)}{x}+\frac {b \operatorname {ExpIntegralEi}\left (-b^2 x^2\right )}{\sqrt {\pi }} \]
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Time = 0.60 (sec) , antiderivative size = 26, normalized size of antiderivative = 1.00
method | result | size |
parts | \(-\frac {\operatorname {erf}\left (b x \right )}{x}-\frac {b \,\operatorname {Ei}_{1}\left (b^{2} x^{2}\right )}{\sqrt {\pi }}\) | \(26\) |
derivativedivides | \(b \left (-\frac {\operatorname {erf}\left (b x \right )}{b x}-\frac {\operatorname {Ei}_{1}\left (b^{2} x^{2}\right )}{\sqrt {\pi }}\right )\) | \(30\) |
default | \(b \left (-\frac {\operatorname {erf}\left (b x \right )}{b x}-\frac {\operatorname {Ei}_{1}\left (b^{2} x^{2}\right )}{\sqrt {\pi }}\right )\) | \(30\) |
meijerg | \(\frac {b \left (-\frac {2 b^{2} x^{2} \operatorname {hypergeom}\left (\left [1, 1, \frac {3}{2}\right ], \left [2, 2, \frac {5}{2}\right ], -b^{2} x^{2}\right )}{3}+2 \gamma -4+4 \ln \left (x \right )+4 \ln \left (b \right )\right )}{2 \sqrt {\pi }}\) | \(45\) |
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Time = 0.26 (sec) , antiderivative size = 30, normalized size of antiderivative = 1.15 \[ \int \frac {\text {erf}(b x)}{x^2} \, dx=\frac {\sqrt {\pi } b x {\rm Ei}\left (-b^{2} x^{2}\right ) - \pi \operatorname {erf}\left (b x\right )}{\pi x} \]
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Time = 0.57 (sec) , antiderivative size = 24, normalized size of antiderivative = 0.92 \[ \int \frac {\text {erf}(b x)}{x^2} \, dx=- \frac {b \operatorname {E}_{1}\left (b^{2} x^{2}\right )}{\sqrt {\pi }} + \frac {\operatorname {erfc}{\left (b x \right )}}{x} - \frac {1}{x} \]
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Time = 0.28 (sec) , antiderivative size = 24, normalized size of antiderivative = 0.92 \[ \int \frac {\text {erf}(b x)}{x^2} \, dx=\frac {b {\rm Ei}\left (-b^{2} x^{2}\right )}{\sqrt {\pi }} - \frac {\operatorname {erf}\left (b x\right )}{x} \]
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Time = 0.27 (sec) , antiderivative size = 24, normalized size of antiderivative = 0.92 \[ \int \frac {\text {erf}(b x)}{x^2} \, dx=\frac {b {\rm Ei}\left (-b^{2} x^{2}\right )}{\sqrt {\pi }} - \frac {\operatorname {erf}\left (b x\right )}{x} \]
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Time = 5.42 (sec) , antiderivative size = 24, normalized size of antiderivative = 0.92 \[ \int \frac {\text {erf}(b x)}{x^2} \, dx=\frac {b\,\mathrm {ei}\left (-b^2\,x^2\right )}{\sqrt {\pi }}-\frac {\mathrm {erf}\left (b\,x\right )}{x} \]
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