Integrand size = 18, antiderivative size = 63 \[ \int \cos \left (c-i b^2 x^2\right ) \text {erfi}(b x) \, dx=\frac {e^{i c} \sqrt {\pi } \text {erfi}(b x)^2}{8 b}+\frac {b e^{-i c} x^2 \, _2F_2\left (1,1;\frac {3}{2},2;-b^2 x^2\right )}{2 \sqrt {\pi }} \]
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Time = 0.05 (sec) , antiderivative size = 63, normalized size of antiderivative = 1.00, number of steps used = 4, number of rules used = 4, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.222, Rules used = {6544, 6513, 6510, 30} \[ \int \cos \left (c-i b^2 x^2\right ) \text {erfi}(b x) \, dx=\frac {b e^{-i c} x^2 \, _2F_2\left (1,1;\frac {3}{2},2;-b^2 x^2\right )}{2 \sqrt {\pi }}+\frac {\sqrt {\pi } e^{i c} \text {erfi}(b x)^2}{8 b} \]
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Rule 30
Rule 6510
Rule 6513
Rule 6544
Rubi steps \begin{align*} \text {integral}& = \frac {1}{2} \int e^{-i c-b^2 x^2} \text {erfi}(b x) \, dx+\frac {1}{2} \int e^{i c+b^2 x^2} \text {erfi}(b x) \, dx \\ & = \frac {b e^{-i c} x^2 \, _2F_2\left (1,1;\frac {3}{2},2;-b^2 x^2\right )}{2 \sqrt {\pi }}+\frac {\left (e^{i c} \sqrt {\pi }\right ) \text {Subst}(\int x \, dx,x,\text {erfi}(b x))}{4 b} \\ & = \frac {e^{i c} \sqrt {\pi } \text {erfi}(b x)^2}{8 b}+\frac {b e^{-i c} x^2 \, _2F_2\left (1,1;\frac {3}{2},2;-b^2 x^2\right )}{2 \sqrt {\pi }} \\ \end{align*}
\[ \int \cos \left (c-i b^2 x^2\right ) \text {erfi}(b x) \, dx=\int \cos \left (c-i b^2 x^2\right ) \text {erfi}(b x) \, dx \]
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\[\int \cos \left (i b^{2} x^{2}-c \right ) \operatorname {erfi}\left (b x \right )d x\]
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\[ \int \cos \left (c-i b^2 x^2\right ) \text {erfi}(b x) \, dx=\int { \cos \left (i \, b^{2} x^{2} - c\right ) \operatorname {erfi}\left (b x\right ) \,d x } \]
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\[ \int \cos \left (c-i b^2 x^2\right ) \text {erfi}(b x) \, dx=\int \cos {\left (i b^{2} x^{2} - c \right )} \operatorname {erfi}{\left (b x \right )}\, dx \]
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\[ \int \cos \left (c-i b^2 x^2\right ) \text {erfi}(b x) \, dx=\int { \cos \left (i \, b^{2} x^{2} - c\right ) \operatorname {erfi}\left (b x\right ) \,d x } \]
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\[ \int \cos \left (c-i b^2 x^2\right ) \text {erfi}(b x) \, dx=\int { \cos \left (i \, b^{2} x^{2} - c\right ) \operatorname {erfi}\left (b x\right ) \,d x } \]
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Timed out. \[ \int \cos \left (c-i b^2 x^2\right ) \text {erfi}(b x) \, dx=\int \cos \left (c-b^2\,x^2\,1{}\mathrm {i}\right )\,\mathrm {erfi}\left (b\,x\right ) \,d x \]
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