Optimal. Leaf size=70 \[ \frac {x^2 \, _2F_2\left (1,1;\frac {3}{2},2;-b^2 x^2\right )}{2 \sqrt {\pi } b}-\frac {x e^{-b^2 x^2} \text {erfi}(b x)}{2 b^2}+\frac {x^2}{2 \sqrt {\pi } b} \]
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Rubi [A] time = 0.06, antiderivative size = 70, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 3, integrand size = 18, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.167, Rules used = {6387, 6378, 30} \[ \frac {x^2 \, _2F_2\left (1,1;\frac {3}{2},2;-b^2 x^2\right )}{2 \sqrt {\pi } b}-\frac {x e^{-b^2 x^2} \text {Erfi}(b x)}{2 b^2}+\frac {x^2}{2 \sqrt {\pi } b} \]
Antiderivative was successfully verified.
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Rule 30
Rule 6378
Rule 6387
Rubi steps
\begin {align*} \int e^{-b^2 x^2} x^2 \text {erfi}(b x) \, dx &=-\frac {e^{-b^2 x^2} x \text {erfi}(b x)}{2 b^2}+\frac {\int e^{-b^2 x^2} \text {erfi}(b x) \, dx}{2 b^2}+\frac {\int x \, dx}{b \sqrt {\pi }}\\ &=\frac {x^2}{2 b \sqrt {\pi }}-\frac {e^{-b^2 x^2} x \text {erfi}(b x)}{2 b^2}+\frac {x^2 \, _2F_2\left (1,1;\frac {3}{2},2;-b^2 x^2\right )}{2 b \sqrt {\pi }}\\ \end {align*}
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Mathematica [A] time = 0.02, size = 36, normalized size = 0.51 \[ \frac {x^2 \left (1-\, _2F_2\left (1,1;\frac {1}{2},2;-b^2 x^2\right )\right )}{2 \sqrt {\pi } b} \]
Warning: Unable to verify antiderivative.
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fricas [F] time = 0.40, size = 0, normalized size = 0.00 \[ {\rm integral}\left (x^{2} \operatorname {erfi}\left (b x\right ) e^{\left (-b^{2} x^{2}\right )}, x\right ) \]
Verification of antiderivative is not currently implemented for this CAS.
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giac [F] time = 0.00, size = 0, normalized size = 0.00 \[ \int x^{2} \operatorname {erfi}\left (b x\right ) e^{\left (-b^{2} x^{2}\right )}\,{d x} \]
Verification of antiderivative is not currently implemented for this CAS.
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maple [F] time = 0.06, size = 0, normalized size = 0.00 \[ \int x^{2} \erfi \left (b x \right ) {\mathrm e}^{-b^{2} x^{2}}\, dx \]
Verification of antiderivative is not currently implemented for this CAS.
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maxima [F] time = 0.00, size = 0, normalized size = 0.00 \[ \int x^{2} \operatorname {erfi}\left (b x\right ) e^{\left (-b^{2} x^{2}\right )}\,{d x} \]
Verification of antiderivative is not currently implemented for this CAS.
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mupad [F] time = 0.00, size = -1, normalized size = -0.01 \[ \int x^2\,{\mathrm {e}}^{-b^2\,x^2}\,\mathrm {erfi}\left (b\,x\right ) \,d x \]
Verification of antiderivative is not currently implemented for this CAS.
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sympy [F(-2)] time = 0.00, size = 0, normalized size = 0.00 \[ \text {Exception raised: AttributeError} \]
Verification of antiderivative is not currently implemented for this CAS.
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