3.287 \(\int e^{\cosh ^{-1}(a+b x)^2} \, dx\)

Optimal. Leaf size=65 \[ \frac{\sqrt{\pi } \text{Erfi}\left (\frac{1}{2} \left (2 \cosh ^{-1}(a+b x)+1\right )\right )}{4 \sqrt [4]{e} b}-\frac{\sqrt{\pi } \text{Erfi}\left (\frac{1}{2} \left (2 \cosh ^{-1}(a+b x)-1\right )\right )}{4 \sqrt [4]{e} b} \]

[Out]

-(Sqrt[Pi]*Erfi[(-1 + 2*ArcCosh[a + b*x])/2])/(4*b*E^(1/4)) + (Sqrt[Pi]*Erfi[(1 + 2*ArcCosh[a + b*x])/2])/(4*b
*E^(1/4))

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Rubi [A]  time = 0.054025, antiderivative size = 65, normalized size of antiderivative = 1., number of steps used = 7, number of rules used = 4, integrand size = 10, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.4, Rules used = {5897, 5512, 2234, 2204} \[ \frac{\sqrt{\pi } \text{Erfi}\left (\frac{1}{2} \left (2 \cosh ^{-1}(a+b x)+1\right )\right )}{4 \sqrt [4]{e} b}-\frac{\sqrt{\pi } \text{Erfi}\left (\frac{1}{2} \left (2 \cosh ^{-1}(a+b x)-1\right )\right )}{4 \sqrt [4]{e} b} \]

Antiderivative was successfully verified.

[In]

Int[E^ArcCosh[a + b*x]^2,x]

[Out]

-(Sqrt[Pi]*Erfi[(-1 + 2*ArcCosh[a + b*x])/2])/(4*b*E^(1/4)) + (Sqrt[Pi]*Erfi[(1 + 2*ArcCosh[a + b*x])/2])/(4*b
*E^(1/4))

Rule 5897

Int[(f_)^(ArcCosh[(a_.) + (b_.)*(x_)]^(n_.)*(c_.)), x_Symbol] :> Dist[1/b, Subst[Int[f^(c*x^n)*Sinh[x], x], x,
ArcCosh[a + b*x]], x] /; FreeQ[{a, b, c, f}, x] && IGtQ[n, 0]

Rule 5512

Int[(F_)^(u_)*Sinh[v_]^(n_.), x_Symbol] :> Int[ExpandTrigToExp[F^u, Sinh[v]^n, x], x] /; FreeQ[F, x] && (Linea
rQ[u, x] || PolyQ[u, x, 2]) && (LinearQ[v, x] || PolyQ[v, x, 2]) && IGtQ[n, 0]

Rule 2234

Int[(F_)^((a_.) + (b_.)*(x_) + (c_.)*(x_)^2), x_Symbol] :> Dist[F^(a - b^2/(4*c)), Int[F^((b + 2*c*x)^2/(4*c))
, x], x] /; FreeQ[{F, a, b, c}, x]

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]

Rubi steps

\begin{align*} \int e^{\cosh ^{-1}(a+b x)^2} \, dx &=\frac{\operatorname{Subst}\left (\int e^{x^2} \sinh (x) \, dx,x,\cosh ^{-1}(a+b x)\right )}{b}\\ &=\frac{\operatorname{Subst}\left (\int \left (-\frac{1}{2} e^{-x+x^2}+\frac{e^{x+x^2}}{2}\right ) \, dx,x,\cosh ^{-1}(a+b x)\right )}{b}\\ &=-\frac{\operatorname{Subst}\left (\int e^{-x+x^2} \, dx,x,\cosh ^{-1}(a+b x)\right )}{2 b}+\frac{\operatorname{Subst}\left (\int e^{x+x^2} \, dx,x,\cosh ^{-1}(a+b x)\right )}{2 b}\\ &=-\frac{\operatorname{Subst}\left (\int e^{\frac{1}{4} (-1+2 x)^2} \, dx,x,\cosh ^{-1}(a+b x)\right )}{2 b \sqrt [4]{e}}+\frac{\operatorname{Subst}\left (\int e^{\frac{1}{4} (1+2 x)^2} \, dx,x,\cosh ^{-1}(a+b x)\right )}{2 b \sqrt [4]{e}}\\ &=-\frac{\sqrt{\pi } \text{erfi}\left (\frac{1}{2} \left (-1+2 \cosh ^{-1}(a+b x)\right )\right )}{4 b \sqrt [4]{e}}+\frac{\sqrt{\pi } \text{erfi}\left (\frac{1}{2} \left (1+2 \cosh ^{-1}(a+b x)\right )\right )}{4 b \sqrt [4]{e}}\\ \end{align*}

Mathematica [A]  time = 0.0349985, size = 42, normalized size = 0.65 \[ \frac{\sqrt{\pi } \left (\text{Erfi}\left (\frac{1}{2}-\cosh ^{-1}(a+b x)\right )+\text{Erfi}\left (\cosh ^{-1}(a+b x)+\frac{1}{2}\right )\right )}{4 \sqrt [4]{e} b} \]

Antiderivative was successfully verified.

[In]

Integrate[E^ArcCosh[a + b*x]^2,x]

[Out]

(Sqrt[Pi]*(Erfi[1/2 - ArcCosh[a + b*x]] + Erfi[1/2 + ArcCosh[a + b*x]]))/(4*b*E^(1/4))

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Maple [F]  time = 0.005, size = 0, normalized size = 0. \begin{align*} \int{{\rm e}^{ \left ({\rm arccosh} \left (bx+a\right ) \right ) ^{2}}}\, dx \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(exp(arccosh(b*x+a)^2),x)

[Out]

int(exp(arccosh(b*x+a)^2),x)

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

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(exp(arccosh(b*x+a)^2),x, algorithm="maxima")

[Out]

integrate(e^(arccosh(b*x + a)^2), x)

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Fricas [F]  time = 0., size = 0, normalized size = 0. \begin{align*}{\rm integral}\left (e^{\left (\operatorname{arcosh}\left (b x + a\right )^{2}\right )}, x\right ) \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(exp(arccosh(b*x+a)^2),x, algorithm="fricas")

[Out]

integral(e^(arccosh(b*x + a)^2), x)

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

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(exp(acosh(b*x+a)**2),x)

[Out]

Integral(exp(acosh(a + b*x)**2), x)

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

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(exp(arccosh(b*x+a)^2),x, algorithm="giac")

[Out]

integrate(e^(arccosh(b*x + a)^2), x)