3.41 \(\int \sqrt{a \text{sech}^3(x)} \, dx\)

Optimal. Leaf size=46 \[ 2 \sinh (x) \cosh (x) \sqrt{a \text{sech}^3(x)}+2 i \cosh ^{\frac{3}{2}}(x) E\left (\left .\frac{i x}{2}\right |2\right ) \sqrt{a \text{sech}^3(x)} \]

[Out]

(2*I)*Cosh[x]^(3/2)*EllipticE[(I/2)*x, 2]*Sqrt[a*Sech[x]^3] + 2*Cosh[x]*Sqrt[a*Sech[x]^3]*Sinh[x]

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Rubi [A]  time = 0.0342023, antiderivative size = 46, normalized size of antiderivative = 1., number of steps used = 4, number of rules used = 4, integrand size = 10, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.4, Rules used = {4123, 3768, 3771, 2639} \[ 2 \sinh (x) \cosh (x) \sqrt{a \text{sech}^3(x)}+2 i \cosh ^{\frac{3}{2}}(x) E\left (\left .\frac{i x}{2}\right |2\right ) \sqrt{a \text{sech}^3(x)} \]

Antiderivative was successfully verified.

[In]

Int[Sqrt[a*Sech[x]^3],x]

[Out]

(2*I)*Cosh[x]^(3/2)*EllipticE[(I/2)*x, 2]*Sqrt[a*Sech[x]^3] + 2*Cosh[x]*Sqrt[a*Sech[x]^3]*Sinh[x]

Rule 4123

Int[((b_.)*((c_.)*sec[(e_.) + (f_.)*(x_)])^(n_))^(p_), x_Symbol] :> Dist[(b^IntPart[p]*(b*(c*Sec[e + f*x])^n)^
FracPart[p])/(c*Sec[e + f*x])^(n*FracPart[p]), Int[(c*Sec[e + f*x])^(n*p), x], x] /; FreeQ[{b, c, e, f, n, p},
x] &&  !IntegerQ[p]

Rule 3768

Int[(csc[(c_.) + (d_.)*(x_)]*(b_.))^(n_), x_Symbol] :> -Simp[(b*Cos[c + d*x]*(b*Csc[c + d*x])^(n - 1))/(d*(n -
1)), x] + Dist[(b^2*(n - 2))/(n - 1), Int[(b*Csc[c + d*x])^(n - 2), x], x] /; FreeQ[{b, c, d}, x] && GtQ[n, 1
] && IntegerQ[2*n]

Rule 3771

Int[(csc[(c_.) + (d_.)*(x_)]*(b_.))^(n_), x_Symbol] :> Dist[(b*Csc[c + d*x])^n*Sin[c + d*x]^n, Int[1/Sin[c + d
*x]^n, x], x] /; FreeQ[{b, c, d}, x] && EqQ[n^2, 1/4]

Rule 2639

Int[Sqrt[sin[(c_.) + (d_.)*(x_)]], x_Symbol] :> Simp[(2*EllipticE[(1*(c - Pi/2 + d*x))/2, 2])/d, x] /; FreeQ[{
c, d}, x]

Rubi steps

\begin{align*} \int \sqrt{a \text{sech}^3(x)} \, dx &=\frac{\sqrt{a \text{sech}^3(x)} \int \text{sech}^{\frac{3}{2}}(x) \, dx}{\text{sech}^{\frac{3}{2}}(x)}\\ &=2 \cosh (x) \sqrt{a \text{sech}^3(x)} \sinh (x)-\frac{\sqrt{a \text{sech}^3(x)} \int \frac{1}{\sqrt{\text{sech}(x)}} \, dx}{\text{sech}^{\frac{3}{2}}(x)}\\ &=2 \cosh (x) \sqrt{a \text{sech}^3(x)} \sinh (x)-\left (\cosh ^{\frac{3}{2}}(x) \sqrt{a \text{sech}^3(x)}\right ) \int \sqrt{\cosh (x)} \, dx\\ &=2 i \cosh ^{\frac{3}{2}}(x) E\left (\left .\frac{i x}{2}\right |2\right ) \sqrt{a \text{sech}^3(x)}+2 \cosh (x) \sqrt{a \text{sech}^3(x)} \sinh (x)\\ \end{align*}

Mathematica [A]  time = 0.0187185, size = 36, normalized size = 0.78 \[ 2 \cosh (x) \sqrt{a \text{sech}^3(x)} \left (\sinh (x)+i \sqrt{\cosh (x)} E\left (\left .\frac{i x}{2}\right |2\right )\right ) \]

Antiderivative was successfully verified.

[In]

Integrate[Sqrt[a*Sech[x]^3],x]

[Out]

2*Cosh[x]*Sqrt[a*Sech[x]^3]*(I*Sqrt[Cosh[x]]*EllipticE[(I/2)*x, 2] + Sinh[x])

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Maple [F]  time = 0.073, size = 0, normalized size = 0. \begin{align*} \int \sqrt{a \left ({\rm sech} \left (x\right ) \right ) ^{3}}\, dx \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int((a*sech(x)^3)^(1/2),x)

[Out]

int((a*sech(x)^3)^(1/2),x)

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Maxima [F]  time = 0., size = 0, normalized size = 0. \begin{align*} \int \sqrt{a \operatorname{sech}\left (x\right )^{3}}\,{d x} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate((a*sech(x)^3)^(1/2),x, algorithm="maxima")

[Out]

integrate(sqrt(a*sech(x)^3), x)

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Fricas [F]  time = 0., size = 0, normalized size = 0. \begin{align*}{\rm integral}\left (\sqrt{a \operatorname{sech}\left (x\right )^{3}}, x\right ) \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate((a*sech(x)^3)^(1/2),x, algorithm="fricas")

[Out]

integral(sqrt(a*sech(x)^3), x)

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Sympy [F]  time = 0., size = 0, normalized size = 0. \begin{align*} \int \sqrt{a \operatorname{sech}^{3}{\left (x \right )}}\, dx \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate((a*sech(x)**3)**(1/2),x)

[Out]

Integral(sqrt(a*sech(x)**3), x)

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Giac [F]  time = 0., size = 0, normalized size = 0. \begin{align*} \int \sqrt{a \operatorname{sech}\left (x\right )^{3}}\,{d x} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate((a*sech(x)^3)^(1/2),x, algorithm="giac")

[Out]

integrate(sqrt(a*sech(x)^3), x)