3.99 \(\int \cos (c-i b^2 x^2) \text{Erf}(b x) \, dx\)

Optimal. Leaf size=62 \[ \frac{b e^{i c} x^2 \text{HypergeometricPFQ}\left (\{1,1\},\left \{\frac{3}{2},2\right \},b^2 x^2\right )}{2 \sqrt{\pi }}+\frac{\sqrt{\pi } e^{-i c} \text{Erf}(b x)^2}{8 b} \]

[Out]

(Sqrt[Pi]*Erf[b*x]^2)/(8*b*E^(I*c)) + (b*E^(I*c)*x^2*HypergeometricPFQ[{1, 1}, {3/2, 2}, b^2*x^2])/(2*Sqrt[Pi]
)

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Rubi [A]  time = 0.0547896, antiderivative size = 62, normalized size of antiderivative = 1., number of steps used = 4, number of rules used = 4, integrand size = 18, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.222, Rules used = {6407, 6373, 30, 6376} \[ \frac{b e^{i c} x^2 \, _2F_2\left (1,1;\frac{3}{2},2;b^2 x^2\right )}{2 \sqrt{\pi }}+\frac{\sqrt{\pi } e^{-i c} \text{Erf}(b x)^2}{8 b} \]

Antiderivative was successfully verified.

[In]

Int[Cos[c - I*b^2*x^2]*Erf[b*x],x]

[Out]

(Sqrt[Pi]*Erf[b*x]^2)/(8*b*E^(I*c)) + (b*E^(I*c)*x^2*HypergeometricPFQ[{1, 1}, {3/2, 2}, b^2*x^2])/(2*Sqrt[Pi]
)

Rule 6407

Int[Cos[(c_.) + (d_.)*(x_)^2]*Erf[(b_.)*(x_)], x_Symbol] :> Dist[1/2, Int[E^(-(I*c) - I*d*x^2)*Erf[b*x], x], x
] + Dist[1/2, Int[E^(I*c + I*d*x^2)*Erf[b*x], x], x] /; FreeQ[{b, c, d}, x] && EqQ[d^2, -b^4]

Rule 6373

Int[E^((c_.) + (d_.)*(x_)^2)*Erf[(b_.)*(x_)]^(n_.), x_Symbol] :> Dist[(E^c*Sqrt[Pi])/(2*b), Subst[Int[x^n, x],
x, Erf[b*x]], x] /; FreeQ[{b, c, d, n}, x] && EqQ[d, -b^2]

Rule 30

Int[(x_)^(m_.), x_Symbol] :> Simp[x^(m + 1)/(m + 1), x] /; FreeQ[m, x] && NeQ[m, -1]

Rule 6376

Int[E^((c_.) + (d_.)*(x_)^2)*Erf[(b_.)*(x_)], x_Symbol] :> Simp[(b*E^c*x^2*HypergeometricPFQ[{1, 1}, {3/2, 2},
b^2*x^2])/Sqrt[Pi], x] /; FreeQ[{b, c, d}, x] && EqQ[d, b^2]

Rubi steps

\begin{align*} \int \cos \left (c-i b^2 x^2\right ) \text{erf}(b x) \, dx &=\frac{1}{2} \int e^{-i c-b^2 x^2} \text{erf}(b x) \, dx+\frac{1}{2} \int e^{i c+b^2 x^2} \text{erf}(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 ) \operatorname{Subst}(\int x \, dx,x,\text{erf}(b x))}{4 b}\\ &=\frac{e^{-i c} \sqrt{\pi } \text{erf}(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*}

Mathematica [F]  time = 0.64351, size = 0, normalized size = 0. \[ \int \cos \left (c-i b^2 x^2\right ) \text{Erf}(b x) \, dx \]

Verification is Not applicable to the result.

[In]

Integrate[Cos[c - I*b^2*x^2]*Erf[b*x],x]

[Out]

Integrate[Cos[c - I*b^2*x^2]*Erf[b*x], x]

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Maple [F]  time = 0.077, size = 0, normalized size = 0. \begin{align*} \int \cos \left ( -c+i{b}^{2}{x}^{2} \right ){\it Erf} \left ( bx \right ) \, dx \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(cos(-c+I*b^2*x^2)*erf(b*x),x)

[Out]

int(cos(-c+I*b^2*x^2)*erf(b*x),x)

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Maxima [F]  time = 0., size = 0, normalized size = 0. \begin{align*} \frac{\sqrt{\pi } \cos \left (c\right ) \operatorname{erf}\left (b x\right )^{2}}{8 \, b} - \frac{i \, \sqrt{\pi } \operatorname{erf}\left (b x\right )^{2} \sin \left (c\right )}{8 \, b} + \frac{1}{2} \, \cos \left (c\right ) \int \operatorname{erf}\left (b x\right ) e^{\left (b^{2} x^{2}\right )}\,{d x} + \frac{1}{2} i \, \int \operatorname{erf}\left (b x\right ) e^{\left (b^{2} x^{2}\right )}\,{d x} \sin \left (c\right ) \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(cos(-c+I*b^2*x^2)*erf(b*x),x, algorithm="maxima")

[Out]

1/8*sqrt(pi)*cos(c)*erf(b*x)^2/b - 1/8*I*sqrt(pi)*erf(b*x)^2*sin(c)/b + 1/2*cos(c)*integrate(erf(b*x)*e^(b^2*x
^2), x) + 1/2*I*integrate(erf(b*x)*e^(b^2*x^2), x)*sin(c)

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Fricas [F]  time = 0., size = 0, normalized size = 0. \begin{align*}{\rm integral}\left (\frac{1}{2} \,{\left (\operatorname{erf}\left (b x\right ) e^{\left (-2 \, b^{2} x^{2} - 2 i \, c\right )} + \operatorname{erf}\left (b x\right )\right )} e^{\left (b^{2} x^{2} + i \, c\right )}, x\right ) \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(cos(-c+I*b^2*x^2)*erf(b*x),x, algorithm="fricas")

[Out]

integral(1/2*(erf(b*x)*e^(-2*b^2*x^2 - 2*I*c) + erf(b*x))*e^(b^2*x^2 + I*c), x)

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Sympy [F]  time = 0., size = 0, normalized size = 0. \begin{align*} \int \cos{\left (i b^{2} x^{2} - c \right )} \operatorname{erf}{\left (b x \right )}\, dx \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(cos(-c+I*b**2*x**2)*erf(b*x),x)

[Out]

Integral(cos(I*b**2*x**2 - c)*erf(b*x), x)

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Giac [F]  time = 0., size = 0, normalized size = 0. \begin{align*} \int \cos \left (i \, b^{2} x^{2} - c\right ) \operatorname{erf}\left (b x\right )\,{d x} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(cos(-c+I*b^2*x^2)*erf(b*x),x, algorithm="giac")

[Out]

integrate(cos(I*b^2*x^2 - c)*erf(b*x), x)