Integrand size = 15, antiderivative size = 75 \[ \int \cosh \left (c+b^2 x^2\right ) \text {erfc}(b x) \, dx=-\frac {e^{-c} \sqrt {\pi } \text {erfc}(b x)^2}{8 b}+\frac {e^c \sqrt {\pi } \text {erfi}(b x)}{4 b}-\frac {b e^c x^2 \, _2F_2\left (1,1;\frac {3}{2},2;b^2 x^2\right )}{2 \sqrt {\pi }} \]
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Time = 0.06 (sec) , antiderivative size = 75, normalized size of antiderivative = 1.00, number of steps used = 6, number of rules used = 6, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.400, Rules used = {6549, 6512, 2235, 6511, 6509, 30} \[ \int \cosh \left (c+b^2 x^2\right ) \text {erfc}(b x) \, dx=-\frac {b e^c x^2 \, _2F_2\left (1,1;\frac {3}{2},2;b^2 x^2\right )}{2 \sqrt {\pi }}-\frac {\sqrt {\pi } e^{-c} \text {erfc}(b x)^2}{8 b}+\frac {\sqrt {\pi } e^c \text {erfi}(b x)}{4 b} \]
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Rule 30
Rule 2235
Rule 6509
Rule 6511
Rule 6512
Rule 6549
Rubi steps \begin{align*} \text {integral}& = \frac {1}{2} \int e^{-c-b^2 x^2} \text {erfc}(b x) \, dx+\frac {1}{2} \int e^{c+b^2 x^2} \text {erfc}(b x) \, dx \\ & = \frac {1}{2} \int e^{c+b^2 x^2} \, dx-\frac {1}{2} \int e^{c+b^2 x^2} \text {erf}(b x) \, dx-\frac {\left (e^{-c} \sqrt {\pi }\right ) \text {Subst}(\int x \, dx,x,\text {erfc}(b x))}{4 b} \\ & = -\frac {e^{-c} \sqrt {\pi } \text {erfc}(b x)^2}{8 b}+\frac {e^c \sqrt {\pi } \text {erfi}(b x)}{4 b}-\frac {b e^c x^2 \, _2F_2\left (1,1;\frac {3}{2},2;b^2 x^2\right )}{2 \sqrt {\pi }} \\ \end{align*}
Time = 0.07 (sec) , antiderivative size = 94, normalized size of antiderivative = 1.25 \[ \int \cosh \left (c+b^2 x^2\right ) \text {erfc}(b x) \, dx=\frac {4 b^2 x^2 \, _2F_2\left (1,1;\frac {3}{2},2;-b^2 x^2\right ) (\cosh (c)+\sinh (c))+\pi \left (\text {erf}(b x)^2 (-\cosh (c)+\sinh (c))+2 \text {erfi}(b x) (\cosh (c)+\sinh (c))-2 \text {erf}(b x) (-\cosh (c)+\sinh (c)+\text {erfi}(b x) (\cosh (c)+\sinh (c)))\right )}{8 b \sqrt {\pi }} \]
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\[\int \cosh \left (b^{2} x^{2}+c \right ) \operatorname {erfc}\left (b x \right )d x\]
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\[ \int \cosh \left (c+b^2 x^2\right ) \text {erfc}(b x) \, dx=\int { \cosh \left (b^{2} x^{2} + c\right ) \operatorname {erfc}\left (b x\right ) \,d x } \]
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\[ \int \cosh \left (c+b^2 x^2\right ) \text {erfc}(b x) \, dx=\int \cosh {\left (b^{2} x^{2} + c \right )} \operatorname {erfc}{\left (b x \right )}\, dx \]
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\[ \int \cosh \left (c+b^2 x^2\right ) \text {erfc}(b x) \, dx=\int { \cosh \left (b^{2} x^{2} + c\right ) \operatorname {erfc}\left (b x\right ) \,d x } \]
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\[ \int \cosh \left (c+b^2 x^2\right ) \text {erfc}(b x) \, dx=\int { \cosh \left (b^{2} x^{2} + c\right ) \operatorname {erfc}\left (b x\right ) \,d x } \]
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Timed out. \[ \int \cosh \left (c+b^2 x^2\right ) \text {erfc}(b x) \, dx=\int \mathrm {cosh}\left (b^2\,x^2+c\right )\,\mathrm {erfc}\left (b\,x\right ) \,d x \]
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