Optimal. Leaf size=65 \[ \frac{1}{4} \sqrt{\pi } e^{\frac{b^2}{4}} \text{Erfi}\left (\frac{1}{2} (2 x-i b)\right )+\frac{1}{4} \sqrt{\pi } e^{\frac{b^2}{4}} \text{Erfi}\left (\frac{1}{2} (2 x+i b)\right ) \]
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Rubi [A] time = 0.0473719, antiderivative size = 65, normalized size of antiderivative = 1., number of steps used = 6, number of rules used = 3, integrand size = 10, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.3, Rules used = {4473, 2234, 2204} \[ \frac{1}{4} \sqrt{\pi } e^{\frac{b^2}{4}} \text{Erfi}\left (\frac{1}{2} (2 x-i b)\right )+\frac{1}{4} \sqrt{\pi } e^{\frac{b^2}{4}} \text{Erfi}\left (\frac{1}{2} (2 x+i b)\right ) \]
Antiderivative was successfully verified.
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Rule 4473
Rule 2234
Rule 2204
Rubi steps
\begin{align*} \int e^{x^2} \cos (b x) \, dx &=\int \left (\frac{1}{2} e^{-i b x+x^2}+\frac{1}{2} e^{i b x+x^2}\right ) \, dx\\ &=\frac{1}{2} \int e^{-i b x+x^2} \, dx+\frac{1}{2} \int e^{i b x+x^2} \, dx\\ &=\frac{1}{2} e^{\frac{b^2}{4}} \int e^{\frac{1}{4} (-i b+2 x)^2} \, dx+\frac{1}{2} e^{\frac{b^2}{4}} \int e^{\frac{1}{4} (i b+2 x)^2} \, dx\\ &=\frac{1}{4} e^{\frac{b^2}{4}} \sqrt{\pi } \text{erfi}\left (\frac{1}{2} (-i b+2 x)\right )+\frac{1}{4} e^{\frac{b^2}{4}} \sqrt{\pi } \text{erfi}\left (\frac{1}{2} (i b+2 x)\right )\\ \end{align*}
Mathematica [A] time = 0.0203367, size = 47, normalized size = 0.72 \[ \frac{1}{4} \sqrt{\pi } e^{\frac{b^2}{4}} \left (\text{Erfi}\left (\frac{1}{2} (2 x-i b)\right )+\text{Erfi}\left (\frac{1}{2} (2 x+i b)\right )\right ) \]
Antiderivative was successfully verified.
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Maple [A] time = 0.039, size = 44, normalized size = 0.7 \begin{align*} -{\frac{i}{4}}\sqrt{\pi }{{\rm e}^{{\frac{{b}^{2}}{4}}}}{\it Erf} \left ( ix+{\frac{b}{2}} \right ) +{\frac{i}{4}}\sqrt{\pi }{{\rm e}^{{\frac{{b}^{2}}{4}}}}{\it Erf} \left ( -ix+{\frac{b}{2}} \right ) \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [A] time = 1.0258, size = 51, normalized size = 0.78 \begin{align*} -\frac{1}{4} \, \sqrt{\pi }{\left (i \, \operatorname{erf}\left (\frac{1}{2} \, b + i \, x\right ) e^{\left (\frac{1}{4} \, b^{2}\right )} + i \, \operatorname{erf}\left (-\frac{1}{2} \, b + i \, x\right ) e^{\left (\frac{1}{4} \, b^{2}\right )}\right )} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [A] time = 0.473565, size = 95, normalized size = 1.46 \begin{align*} \frac{1}{4} \, \sqrt{\pi }{\left (-i \, \operatorname{erf}\left (\frac{1}{2} \, b + i \, x\right ) - i \, \operatorname{erf}\left (-\frac{1}{2} \, b + i \, x\right )\right )} e^{\left (\frac{1}{4} \, b^{2}\right )} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [F] time = 0., size = 0, normalized size = 0. \begin{align*} \int e^{x^{2}} \cos{\left (b x \right )}\, dx \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [F] time = 0., size = 0, normalized size = 0. \begin{align*} \int \cos \left (b x\right ) e^{\left (x^{2}\right )}\,{d x} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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