3.43 \(\int \frac{e^{\text{sech}^{-1}(a x)}}{x^7} \, dx\)

Optimal. Leaf size=146 \[ \frac{4 a^3 \sqrt{1-a x}}{105 x^3 \sqrt{\frac{1}{a x+1}}}+\frac{8 a^5 \sqrt{1-a x}}{105 x \sqrt{\frac{1}{a x+1}}}+\frac{a \sqrt{1-a x}}{35 x^5 \sqrt{\frac{1}{a x+1}}}+\frac{\sqrt{1-a x}}{42 a x^7 \sqrt{\frac{1}{a x+1}}}+\frac{1}{42 a x^7}-\frac{e^{\text{sech}^{-1}(a x)}}{6 x^6} \]

[Out]

1/(42*a*x^7) - E^ArcSech[a*x]/(6*x^6) + Sqrt[1 - a*x]/(42*a*x^7*Sqrt[(1 + a*x)^(-1)]) + (a*Sqrt[1 - a*x])/(35*
x^5*Sqrt[(1 + a*x)^(-1)]) + (4*a^3*Sqrt[1 - a*x])/(105*x^3*Sqrt[(1 + a*x)^(-1)]) + (8*a^5*Sqrt[1 - a*x])/(105*
x*Sqrt[(1 + a*x)^(-1)])

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Rubi [A]  time = 0.0711514, antiderivative size = 146, normalized size of antiderivative = 1., number of steps used = 9, number of rules used = 5, integrand size = 10, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.5, Rules used = {6335, 30, 103, 12, 95} \[ \frac{4 a^3 \sqrt{1-a x}}{105 x^3 \sqrt{\frac{1}{a x+1}}}+\frac{8 a^5 \sqrt{1-a x}}{105 x \sqrt{\frac{1}{a x+1}}}+\frac{a \sqrt{1-a x}}{35 x^5 \sqrt{\frac{1}{a x+1}}}+\frac{\sqrt{1-a x}}{42 a x^7 \sqrt{\frac{1}{a x+1}}}+\frac{1}{42 a x^7}-\frac{e^{\text{sech}^{-1}(a x)}}{6 x^6} \]

Antiderivative was successfully verified.

[In]

Int[E^ArcSech[a*x]/x^7,x]

[Out]

1/(42*a*x^7) - E^ArcSech[a*x]/(6*x^6) + Sqrt[1 - a*x]/(42*a*x^7*Sqrt[(1 + a*x)^(-1)]) + (a*Sqrt[1 - a*x])/(35*
x^5*Sqrt[(1 + a*x)^(-1)]) + (4*a^3*Sqrt[1 - a*x])/(105*x^3*Sqrt[(1 + a*x)^(-1)]) + (8*a^5*Sqrt[1 - a*x])/(105*
x*Sqrt[(1 + a*x)^(-1)])

Rule 6335

Int[E^ArcSech[(a_.)*(x_)^(p_.)]*(x_)^(m_.), x_Symbol] :> Simp[(x^(m + 1)*E^ArcSech[a*x^p])/(m + 1), x] + (Dist
[p/(a*(m + 1)), Int[x^(m - p), x], x] + Dist[(p*Sqrt[1 + a*x^p]*Sqrt[1/(1 + a*x^p)])/(a*(m + 1)), Int[x^(m - p
)/(Sqrt[1 + a*x^p]*Sqrt[1 - a*x^p]), x], x]) /; FreeQ[{a, m, p}, x] && NeQ[m, -1]

Rule 30

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

Rule 103

Int[((a_.) + (b_.)*(x_))^(m_)*((c_.) + (d_.)*(x_))^(n_.)*((e_.) + (f_.)*(x_))^(p_.), x_Symbol] :> Simp[(b*(a +
b*x)^(m + 1)*(c + d*x)^(n + 1)*(e + f*x)^(p + 1))/((m + 1)*(b*c - a*d)*(b*e - a*f)), x] + Dist[1/((m + 1)*(b*
c - a*d)*(b*e - a*f)), Int[(a + b*x)^(m + 1)*(c + d*x)^n*(e + f*x)^p*Simp[a*d*f*(m + 1) - b*(d*e*(m + n + 2) +
c*f*(m + p + 2)) - b*d*f*(m + n + p + 3)*x, x], x], x] /; FreeQ[{a, b, c, d, e, f, n, p}, x] && LtQ[m, -1] &&
IntegerQ[m] && (IntegerQ[n] || IntegersQ[2*n, 2*p])

Rule 12

Int[(a_)*(u_), x_Symbol] :> Dist[a, Int[u, x], x] /; FreeQ[a, x] &&  !MatchQ[u, (b_)*(v_) /; FreeQ[b, x]]

Rule 95

Int[((a_.) + (b_.)*(x_))^(m_)*((c_.) + (d_.)*(x_))^(n_.)*((e_.) + (f_.)*(x_))^(p_.), x_Symbol] :> Simp[(b*(a +
b*x)^(m + 1)*(c + d*x)^(n + 1)*(e + f*x)^(p + 1))/((m + 1)*(b*c - a*d)*(b*e - a*f)), x] /; FreeQ[{a, b, c, d,
e, f, m, n, p}, x] && EqQ[Simplify[m + n + p + 3], 0] && EqQ[a*d*f*(m + 1) + b*c*f*(n + 1) + b*d*e*(p + 1), 0
] && NeQ[m, -1]

Rubi steps

\begin{align*} \int \frac{e^{\text{sech}^{-1}(a x)}}{x^7} \, dx &=-\frac{e^{\text{sech}^{-1}(a x)}}{6 x^6}-\frac{\int \frac{1}{x^8} \, dx}{6 a}-\frac{\left (\sqrt{\frac{1}{1+a x}} \sqrt{1+a x}\right ) \int \frac{1}{x^8 \sqrt{1-a x} \sqrt{1+a x}} \, dx}{6 a}\\ &=\frac{1}{42 a x^7}-\frac{e^{\text{sech}^{-1}(a x)}}{6 x^6}+\frac{\sqrt{1-a x}}{42 a x^7 \sqrt{\frac{1}{1+a x}}}+\frac{\left (\sqrt{\frac{1}{1+a x}} \sqrt{1+a x}\right ) \int -\frac{6 a^2}{x^6 \sqrt{1-a x} \sqrt{1+a x}} \, dx}{42 a}\\ &=\frac{1}{42 a x^7}-\frac{e^{\text{sech}^{-1}(a x)}}{6 x^6}+\frac{\sqrt{1-a x}}{42 a x^7 \sqrt{\frac{1}{1+a x}}}-\frac{1}{7} \left (a \sqrt{\frac{1}{1+a x}} \sqrt{1+a x}\right ) \int \frac{1}{x^6 \sqrt{1-a x} \sqrt{1+a x}} \, dx\\ &=\frac{1}{42 a x^7}-\frac{e^{\text{sech}^{-1}(a x)}}{6 x^6}+\frac{\sqrt{1-a x}}{42 a x^7 \sqrt{\frac{1}{1+a x}}}+\frac{a \sqrt{1-a x}}{35 x^5 \sqrt{\frac{1}{1+a x}}}+\frac{1}{35} \left (a \sqrt{\frac{1}{1+a x}} \sqrt{1+a x}\right ) \int -\frac{4 a^2}{x^4 \sqrt{1-a x} \sqrt{1+a x}} \, dx\\ &=\frac{1}{42 a x^7}-\frac{e^{\text{sech}^{-1}(a x)}}{6 x^6}+\frac{\sqrt{1-a x}}{42 a x^7 \sqrt{\frac{1}{1+a x}}}+\frac{a \sqrt{1-a x}}{35 x^5 \sqrt{\frac{1}{1+a x}}}-\frac{1}{35} \left (4 a^3 \sqrt{\frac{1}{1+a x}} \sqrt{1+a x}\right ) \int \frac{1}{x^4 \sqrt{1-a x} \sqrt{1+a x}} \, dx\\ &=\frac{1}{42 a x^7}-\frac{e^{\text{sech}^{-1}(a x)}}{6 x^6}+\frac{\sqrt{1-a x}}{42 a x^7 \sqrt{\frac{1}{1+a x}}}+\frac{a \sqrt{1-a x}}{35 x^5 \sqrt{\frac{1}{1+a x}}}+\frac{4 a^3 \sqrt{1-a x}}{105 x^3 \sqrt{\frac{1}{1+a x}}}+\frac{1}{105} \left (4 a^3 \sqrt{\frac{1}{1+a x}} \sqrt{1+a x}\right ) \int -\frac{2 a^2}{x^2 \sqrt{1-a x} \sqrt{1+a x}} \, dx\\ &=\frac{1}{42 a x^7}-\frac{e^{\text{sech}^{-1}(a x)}}{6 x^6}+\frac{\sqrt{1-a x}}{42 a x^7 \sqrt{\frac{1}{1+a x}}}+\frac{a \sqrt{1-a x}}{35 x^5 \sqrt{\frac{1}{1+a x}}}+\frac{4 a^3 \sqrt{1-a x}}{105 x^3 \sqrt{\frac{1}{1+a x}}}-\frac{1}{105} \left (8 a^5 \sqrt{\frac{1}{1+a x}} \sqrt{1+a x}\right ) \int \frac{1}{x^2 \sqrt{1-a x} \sqrt{1+a x}} \, dx\\ &=\frac{1}{42 a x^7}-\frac{e^{\text{sech}^{-1}(a x)}}{6 x^6}+\frac{\sqrt{1-a x}}{42 a x^7 \sqrt{\frac{1}{1+a x}}}+\frac{a \sqrt{1-a x}}{35 x^5 \sqrt{\frac{1}{1+a x}}}+\frac{4 a^3 \sqrt{1-a x}}{105 x^3 \sqrt{\frac{1}{1+a x}}}+\frac{8 a^5 \sqrt{1-a x}}{105 x \sqrt{\frac{1}{1+a x}}}\\ \end{align*}

Mathematica [A]  time = 0.085222, size = 76, normalized size = 0.52 \[ \frac{\sqrt{\frac{1-a x}{a x+1}} (a x+1)^2 \left (8 a^5 x^5-8 a^4 x^4+12 a^3 x^3-12 a^2 x^2+15 a x-15\right )-15}{105 a x^7} \]

Warning: Unable to verify antiderivative.

[In]

Integrate[E^ArcSech[a*x]/x^7,x]

[Out]

(-15 + Sqrt[(1 - a*x)/(1 + a*x)]*(1 + a*x)^2*(-15 + 15*a*x - 12*a^2*x^2 + 12*a^3*x^3 - 8*a^4*x^4 + 8*a^5*x^5))
/(105*a*x^7)

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Maple [A]  time = 0.191, size = 71, normalized size = 0.5 \begin{align*}{\frac{ \left ({a}^{2}{x}^{2}-1 \right ) \left ( 8\,{x}^{4}{a}^{4}+12\,{a}^{2}{x}^{2}+15 \right ) }{105\,{x}^{6}}\sqrt{-{\frac{ax-1}{ax}}}\sqrt{{\frac{ax+1}{ax}}}}-{\frac{1}{7\,a{x}^{7}}} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int((1/a/x+(1/a/x-1)^(1/2)*(1+1/a/x)^(1/2))/x^7,x)

[Out]

1/105*(-(a*x-1)/a/x)^(1/2)/x^6*((a*x+1)/a/x)^(1/2)*(a^2*x^2-1)*(8*a^4*x^4+12*a^2*x^2+15)-1/7/a/x^7

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Maxima [A]  time = 1.03706, size = 81, normalized size = 0.55 \begin{align*} \frac{{\left (8 \, a^{6} x^{7} + 4 \, a^{4} x^{5} + 3 \, a^{2} x^{3} - 15 \, x\right )} \sqrt{a x + 1} \sqrt{-a x + 1}}{105 \, a x^{8}} - \frac{1}{7 \, a x^{7}} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate((1/a/x+(1/a/x-1)^(1/2)*(1+1/a/x)^(1/2))/x^7,x, algorithm="maxima")

[Out]

1/105*(8*a^6*x^7 + 4*a^4*x^5 + 3*a^2*x^3 - 15*x)*sqrt(a*x + 1)*sqrt(-a*x + 1)/(a*x^8) - 1/7/(a*x^7)

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Fricas [A]  time = 2.12879, size = 151, normalized size = 1.03 \begin{align*} \frac{{\left (8 \, a^{7} x^{7} + 4 \, a^{5} x^{5} + 3 \, a^{3} x^{3} - 15 \, a x\right )} \sqrt{\frac{a x + 1}{a x}} \sqrt{-\frac{a x - 1}{a x}} - 15}{105 \, a x^{7}} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate((1/a/x+(1/a/x-1)^(1/2)*(1+1/a/x)^(1/2))/x^7,x, algorithm="fricas")

[Out]

1/105*((8*a^7*x^7 + 4*a^5*x^5 + 3*a^3*x^3 - 15*a*x)*sqrt((a*x + 1)/(a*x))*sqrt(-(a*x - 1)/(a*x)) - 15)/(a*x^7)

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Sympy [F]  time = 0., size = 0, normalized size = 0. \begin{align*} \frac{\int \frac{1}{x^{8}}\, dx + \int \frac{a \sqrt{-1 + \frac{1}{a x}} \sqrt{1 + \frac{1}{a x}}}{x^{7}}\, dx}{a} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate((1/a/x+(1/a/x-1)**(1/2)*(1+1/a/x)**(1/2))/x**7,x)

[Out]

(Integral(x**(-8), x) + Integral(a*sqrt(-1 + 1/(a*x))*sqrt(1 + 1/(a*x))/x**7, x))/a

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Giac [F]  time = 0., size = 0, normalized size = 0. \begin{align*} \int \frac{\sqrt{\frac{1}{a x} + 1} \sqrt{\frac{1}{a x} - 1} + \frac{1}{a x}}{x^{7}}\,{d x} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate((1/a/x+(1/a/x-1)^(1/2)*(1+1/a/x)^(1/2))/x^7,x, algorithm="giac")

[Out]

integrate((sqrt(1/(a*x) + 1)*sqrt(1/(a*x) - 1) + 1/(a*x))/x^7, x)