Integrand size = 19, antiderivative size = 21 \[ \int \frac {e^{c-b^2 x^2}}{\text {erf}(b x)^3} \, dx=-\frac {e^c \sqrt {\pi }}{4 b \text {erf}(b x)^2} \]
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Time = 0.02 (sec) , antiderivative size = 21, normalized size of antiderivative = 1.00, number of steps used = 2, number of rules used = 2, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.105, Rules used = {6508, 30} \[ \int \frac {e^{c-b^2 x^2}}{\text {erf}(b x)^3} \, dx=-\frac {\sqrt {\pi } e^c}{4 b \text {erf}(b x)^2} \]
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Rule 30
Rule 6508
Rubi steps \begin{align*} \text {integral}& = \frac {\left (e^c \sqrt {\pi }\right ) \text {Subst}\left (\int \frac {1}{x^3} \, dx,x,\text {erf}(b x)\right )}{2 b} \\ & = -\frac {e^c \sqrt {\pi }}{4 b \text {erf}(b x)^2} \\ \end{align*}
Time = 0.01 (sec) , antiderivative size = 21, normalized size of antiderivative = 1.00 \[ \int \frac {e^{c-b^2 x^2}}{\text {erf}(b x)^3} \, dx=-\frac {e^c \sqrt {\pi }}{4 b \text {erf}(b x)^2} \]
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Time = 0.24 (sec) , antiderivative size = 17, normalized size of antiderivative = 0.81
method | result | size |
default | \(-\frac {{\mathrm e}^{c} \sqrt {\pi }}{4 b \operatorname {erf}\left (b x \right )^{2}}\) | \(17\) |
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none
Time = 0.25 (sec) , antiderivative size = 16, normalized size of antiderivative = 0.76 \[ \int \frac {e^{c-b^2 x^2}}{\text {erf}(b x)^3} \, dx=-\frac {\sqrt {\pi } e^{c}}{4 \, b \operatorname {erf}\left (b x\right )^{2}} \]
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Time = 0.44 (sec) , antiderivative size = 19, normalized size of antiderivative = 0.90 \[ \int \frac {e^{c-b^2 x^2}}{\text {erf}(b x)^3} \, dx=- \frac {\sqrt {\pi } e^{c}}{4 b \operatorname {erf}^{2}{\left (b x \right )}} \]
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none
Time = 0.21 (sec) , antiderivative size = 16, normalized size of antiderivative = 0.76 \[ \int \frac {e^{c-b^2 x^2}}{\text {erf}(b x)^3} \, dx=-\frac {\sqrt {\pi } e^{c}}{4 \, b \operatorname {erf}\left (b x\right )^{2}} \]
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\[ \int \frac {e^{c-b^2 x^2}}{\text {erf}(b x)^3} \, dx=\int { \frac {e^{\left (-b^{2} x^{2} + c\right )}}{\operatorname {erf}\left (b x\right )^{3}} \,d x } \]
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Time = 0.10 (sec) , antiderivative size = 16, normalized size of antiderivative = 0.76 \[ \int \frac {e^{c-b^2 x^2}}{\text {erf}(b x)^3} \, dx=-\frac {\sqrt {\pi }\,{\mathrm {e}}^c}{4\,b\,{\mathrm {erf}\left (b\,x\right )}^2} \]
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