3.6 \(\int \frac{\cosh (a+b x^2)}{x^2} \, dx\)

Optimal. Leaf size=66 \[ -\frac{1}{2} \sqrt{\pi } e^{-a} \sqrt{b} \text{Erf}\left (\sqrt{b} x\right )+\frac{1}{2} \sqrt{\pi } e^a \sqrt{b} \text{Erfi}\left (\sqrt{b} x\right )-\frac{\cosh \left (a+b x^2\right )}{x} \]

[Out]

-(Cosh[a + b*x^2]/x) - (Sqrt[b]*Sqrt[Pi]*Erf[Sqrt[b]*x])/(2*E^a) + (Sqrt[b]*E^a*Sqrt[Pi]*Erfi[Sqrt[b]*x])/2

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Rubi [A]  time = 0.0351556, antiderivative size = 66, normalized size of antiderivative = 1., number of steps used = 4, number of rules used = 4, integrand size = 12, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.333, Rules used = {5327, 5298, 2204, 2205} \[ -\frac{1}{2} \sqrt{\pi } e^{-a} \sqrt{b} \text{Erf}\left (\sqrt{b} x\right )+\frac{1}{2} \sqrt{\pi } e^a \sqrt{b} \text{Erfi}\left (\sqrt{b} x\right )-\frac{\cosh \left (a+b x^2\right )}{x} \]

Antiderivative was successfully verified.

[In]

Int[Cosh[a + b*x^2]/x^2,x]

[Out]

-(Cosh[a + b*x^2]/x) - (Sqrt[b]*Sqrt[Pi]*Erf[Sqrt[b]*x])/(2*E^a) + (Sqrt[b]*E^a*Sqrt[Pi]*Erfi[Sqrt[b]*x])/2

Rule 5327

Int[Cosh[(c_.) + (d_.)*(x_)^(n_)]*((e_.)*(x_))^(m_), x_Symbol] :> Simp[((e*x)^(m + 1)*Cosh[c + d*x^n])/(e*(m +
1)), x] - Dist[(d*n)/(e^n*(m + 1)), Int[(e*x)^(m + n)*Sinh[c + d*x^n], x], x] /; FreeQ[{c, d, e}, x] && IGtQ[
n, 0] && LtQ[m, -1]

Rule 5298

Int[Sinh[(c_.) + (d_.)*(x_)^(n_)], x_Symbol] :> Dist[1/2, Int[E^(c + d*x^n), x], x] - Dist[1/2, Int[E^(-c - d*
x^n), x], x] /; FreeQ[{c, d}, x] && IGtQ[n, 1]

Rule 2204

Int[(F_)^((a_.) + (b_.)*((c_.) + (d_.)*(x_))^2), x_Symbol] :> Simp[(F^a*Sqrt[Pi]*Erfi[(c + d*x)*Rt[b*Log[F], 2
]])/(2*d*Rt[b*Log[F], 2]), x] /; FreeQ[{F, a, b, c, d}, x] && PosQ[b]

Rule 2205

Int[(F_)^((a_.) + (b_.)*((c_.) + (d_.)*(x_))^2), x_Symbol] :> Simp[(F^a*Sqrt[Pi]*Erf[(c + d*x)*Rt[-(b*Log[F]),
2]])/(2*d*Rt[-(b*Log[F]), 2]), x] /; FreeQ[{F, a, b, c, d}, x] && NegQ[b]

Rubi steps

\begin{align*} \int \frac{\cosh \left (a+b x^2\right )}{x^2} \, dx &=-\frac{\cosh \left (a+b x^2\right )}{x}+(2 b) \int \sinh \left (a+b x^2\right ) \, dx\\ &=-\frac{\cosh \left (a+b x^2\right )}{x}-b \int e^{-a-b x^2} \, dx+b \int e^{a+b x^2} \, dx\\ &=-\frac{\cosh \left (a+b x^2\right )}{x}-\frac{1}{2} \sqrt{b} e^{-a} \sqrt{\pi } \text{erf}\left (\sqrt{b} x\right )+\frac{1}{2} \sqrt{b} e^a \sqrt{\pi } \text{erfi}\left (\sqrt{b} x\right )\\ \end{align*}

Mathematica [A]  time = 0.06609, size = 70, normalized size = 1.06 \[ \frac{\sqrt{\pi } \sqrt{b} x (\sinh (a)-\cosh (a)) \text{Erf}\left (\sqrt{b} x\right )+\sqrt{\pi } \sqrt{b} x (\sinh (a)+\cosh (a)) \text{Erfi}\left (\sqrt{b} x\right )-2 \cosh \left (a+b x^2\right )}{2 x} \]

Antiderivative was successfully verified.

[In]

Integrate[Cosh[a + b*x^2]/x^2,x]

[Out]

(-2*Cosh[a + b*x^2] + Sqrt[b]*Sqrt[Pi]*x*Erf[Sqrt[b]*x]*(-Cosh[a] + Sinh[a]) + Sqrt[b]*Sqrt[Pi]*x*Erfi[Sqrt[b]
*x]*(Cosh[a] + Sinh[a]))/(2*x)

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Maple [A]  time = 0.021, size = 70, normalized size = 1.1 \begin{align*} -{\frac{{{\rm e}^{-a}}{{\rm e}^{-b{x}^{2}}}}{2\,x}}-{\frac{{{\rm e}^{-a}}\sqrt{\pi }}{2}\sqrt{b}{\it Erf} \left ( x\sqrt{b} \right ) }-{\frac{{{\rm e}^{a}}{{\rm e}^{b{x}^{2}}}}{2\,x}}+{\frac{{{\rm e}^{a}}b\sqrt{\pi }}{2}{\it Erf} \left ( \sqrt{-b}x \right ){\frac{1}{\sqrt{-b}}}} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(cosh(b*x^2+a)/x^2,x)

[Out]

-1/2*exp(-a)/x*exp(-b*x^2)-1/2*exp(-a)*b^(1/2)*Pi^(1/2)*erf(x*b^(1/2))-1/2*exp(a)*exp(b*x^2)/x+1/2*exp(a)*b*Pi
^(1/2)/(-b)^(1/2)*erf((-b)^(1/2)*x)

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Maxima [A]  time = 1.08783, size = 74, normalized size = 1.12 \begin{align*} -\frac{1}{2} \,{\left (\frac{\sqrt{\pi } \operatorname{erf}\left (\sqrt{b} x\right ) e^{\left (-a\right )}}{\sqrt{b}} - \frac{\sqrt{\pi } \operatorname{erf}\left (\sqrt{-b} x\right ) e^{a}}{\sqrt{-b}}\right )} b - \frac{\cosh \left (b x^{2} + a\right )}{x} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(cosh(b*x^2+a)/x^2,x, algorithm="maxima")

[Out]

-1/2*(sqrt(pi)*erf(sqrt(b)*x)*e^(-a)/sqrt(b) - sqrt(pi)*erf(sqrt(-b)*x)*e^a/sqrt(-b))*b - cosh(b*x^2 + a)/x

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Fricas [B]  time = 1.72823, size = 529, normalized size = 8.02 \begin{align*} -\frac{\sqrt{\pi }{\left (x \cosh \left (b x^{2} + a\right ) \cosh \left (a\right ) + x \cosh \left (b x^{2} + a\right ) \sinh \left (a\right ) +{\left (x \cosh \left (a\right ) + x \sinh \left (a\right )\right )} \sinh \left (b x^{2} + a\right )\right )} \sqrt{-b} \operatorname{erf}\left (\sqrt{-b} x\right ) + \sqrt{\pi }{\left (x \cosh \left (b x^{2} + a\right ) \cosh \left (a\right ) - x \cosh \left (b x^{2} + a\right ) \sinh \left (a\right ) +{\left (x \cosh \left (a\right ) - x \sinh \left (a\right )\right )} \sinh \left (b x^{2} + a\right )\right )} \sqrt{b} \operatorname{erf}\left (\sqrt{b} x\right ) + \cosh \left (b x^{2} + a\right )^{2} + 2 \, \cosh \left (b x^{2} + a\right ) \sinh \left (b x^{2} + a\right ) + \sinh \left (b x^{2} + a\right )^{2} + 1}{2 \,{\left (x \cosh \left (b x^{2} + a\right ) + x \sinh \left (b x^{2} + a\right )\right )}} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(cosh(b*x^2+a)/x^2,x, algorithm="fricas")

[Out]

-1/2*(sqrt(pi)*(x*cosh(b*x^2 + a)*cosh(a) + x*cosh(b*x^2 + a)*sinh(a) + (x*cosh(a) + x*sinh(a))*sinh(b*x^2 + a
))*sqrt(-b)*erf(sqrt(-b)*x) + sqrt(pi)*(x*cosh(b*x^2 + a)*cosh(a) - x*cosh(b*x^2 + a)*sinh(a) + (x*cosh(a) - x
*sinh(a))*sinh(b*x^2 + a))*sqrt(b)*erf(sqrt(b)*x) + cosh(b*x^2 + a)^2 + 2*cosh(b*x^2 + a)*sinh(b*x^2 + a) + si
nh(b*x^2 + a)^2 + 1)/(x*cosh(b*x^2 + a) + x*sinh(b*x^2 + a))

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Sympy [F]  time = 0., size = 0, normalized size = 0. \begin{align*} \int \frac{\cosh{\left (a + b x^{2} \right )}}{x^{2}}\, dx \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(cosh(b*x**2+a)/x**2,x)

[Out]

Integral(cosh(a + b*x**2)/x**2, x)

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Giac [F]  time = 0., size = 0, normalized size = 0. \begin{align*} \int \frac{\cosh \left (b x^{2} + a\right )}{x^{2}}\,{d x} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(cosh(b*x^2+a)/x^2,x, algorithm="giac")

[Out]

integrate(cosh(b*x^2 + a)/x^2, x)