3.668 \(\int \frac{1}{x (-a+b (c x)^n)^{3/2}} \, dx\)

Optimal. Leaf size=56 \[ -\frac{2 \tan ^{-1}\left (\frac{\sqrt{b (c x)^n-a}}{\sqrt{a}}\right )}{a^{3/2} n}-\frac{2}{a n \sqrt{b (c x)^n-a}} \]

[Out]

-2/(a*n*Sqrt[-a + b*(c*x)^n]) - (2*ArcTan[Sqrt[-a + b*(c*x)^n]/Sqrt[a]])/(a^(3/2)*n)

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Rubi [A]  time = 0.0442907, antiderivative size = 56, normalized size of antiderivative = 1., number of steps used = 6, number of rules used = 6, integrand size = 19, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.316, Rules used = {367, 12, 266, 51, 63, 205} \[ -\frac{2 \tan ^{-1}\left (\frac{\sqrt{b (c x)^n-a}}{\sqrt{a}}\right )}{a^{3/2} n}-\frac{2}{a n \sqrt{b (c x)^n-a}} \]

Antiderivative was successfully verified.

[In]

Int[1/(x*(-a + b*(c*x)^n)^(3/2)),x]

[Out]

-2/(a*n*Sqrt[-a + b*(c*x)^n]) - (2*ArcTan[Sqrt[-a + b*(c*x)^n]/Sqrt[a]])/(a^(3/2)*n)

Rule 367

Int[((d_.)*(x_))^(m_.)*((a_) + (b_.)*((c_)*(x_))^(n_))^(p_.), x_Symbol] :> Dist[1/c, Subst[Int[((d*x)/c)^m*(a
+ b*x^n)^p, x], x, c*x], x] /; FreeQ[{a, b, c, d, m, n, p}, x]

Rule 12

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

Rule 266

Int[(x_)^(m_.)*((a_) + (b_.)*(x_)^(n_))^(p_), x_Symbol] :> Dist[1/n, Subst[Int[x^(Simplify[(m + 1)/n] - 1)*(a
+ b*x)^p, x], x, x^n], x] /; FreeQ[{a, b, m, n, p}, x] && IntegerQ[Simplify[(m + 1)/n]]

Rule 51

Int[((a_.) + (b_.)*(x_))^(m_)*((c_.) + (d_.)*(x_))^(n_), x_Symbol] :> Simp[((a + b*x)^(m + 1)*(c + d*x)^(n + 1
))/((b*c - a*d)*(m + 1)), x] - Dist[(d*(m + n + 2))/((b*c - a*d)*(m + 1)), Int[(a + b*x)^(m + 1)*(c + d*x)^n,
x], x] /; FreeQ[{a, b, c, d, n}, x] && NeQ[b*c - a*d, 0] && LtQ[m, -1] &&  !(LtQ[n, -1] && (EqQ[a, 0] || (NeQ[
c, 0] && LtQ[m - n, 0] && IntegerQ[n]))) && IntLinearQ[a, b, c, d, m, n, x]

Rule 63

Int[((a_.) + (b_.)*(x_))^(m_)*((c_.) + (d_.)*(x_))^(n_), x_Symbol] :> With[{p = Denominator[m]}, Dist[p/b, Sub
st[Int[x^(p*(m + 1) - 1)*(c - (a*d)/b + (d*x^p)/b)^n, x], x, (a + b*x)^(1/p)], x]] /; FreeQ[{a, b, c, d}, x] &
& NeQ[b*c - a*d, 0] && LtQ[-1, m, 0] && LeQ[-1, n, 0] && LeQ[Denominator[n], Denominator[m]] && IntLinearQ[a,
b, c, d, m, n, x]

Rule 205

Int[((a_) + (b_.)*(x_)^2)^(-1), x_Symbol] :> Simp[(Rt[a/b, 2]*ArcTan[x/Rt[a/b, 2]])/a, x] /; FreeQ[{a, b}, x]
&& PosQ[a/b]

Rubi steps

\begin{align*} \int \frac{1}{x \left (-a+b (c x)^n\right )^{3/2}} \, dx &=\frac{\operatorname{Subst}\left (\int \frac{c}{x \left (-a+b x^n\right )^{3/2}} \, dx,x,c x\right )}{c}\\ &=\operatorname{Subst}\left (\int \frac{1}{x \left (-a+b x^n\right )^{3/2}} \, dx,x,c x\right )\\ &=\frac{\operatorname{Subst}\left (\int \frac{1}{x (-a+b x)^{3/2}} \, dx,x,(c x)^n\right )}{n}\\ &=-\frac{2}{a n \sqrt{-a+b (c x)^n}}-\frac{\operatorname{Subst}\left (\int \frac{1}{x \sqrt{-a+b x}} \, dx,x,(c x)^n\right )}{a n}\\ &=-\frac{2}{a n \sqrt{-a+b (c x)^n}}-\frac{2 \operatorname{Subst}\left (\int \frac{1}{\frac{a}{b}+\frac{x^2}{b}} \, dx,x,\sqrt{-a+b (c x)^n}\right )}{a b n}\\ &=-\frac{2}{a n \sqrt{-a+b (c x)^n}}-\frac{2 \tan ^{-1}\left (\frac{\sqrt{-a+b (c x)^n}}{\sqrt{a}}\right )}{a^{3/2} n}\\ \end{align*}

Mathematica [C]  time = 0.0308177, size = 44, normalized size = 0.79 \[ -\frac{2 \, _2F_1\left (-\frac{1}{2},1;\frac{1}{2};1-\frac{b (c x)^n}{a}\right )}{a n \sqrt{b (c x)^n-a}} \]

Antiderivative was successfully verified.

[In]

Integrate[1/(x*(-a + b*(c*x)^n)^(3/2)),x]

[Out]

(-2*Hypergeometric2F1[-1/2, 1, 1/2, 1 - (b*(c*x)^n)/a])/(a*n*Sqrt[-a + b*(c*x)^n])

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Maple [A]  time = 0.005, size = 49, normalized size = 0.9 \begin{align*} -2\,{\frac{1}{{a}^{3/2}n}\arctan \left ({\frac{\sqrt{-a+b \left ( cx \right ) ^{n}}}{\sqrt{a}}} \right ) }-2\,{\frac{1}{an\sqrt{-a+b \left ( cx \right ) ^{n}}}} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(1/x/(-a+b*(c*x)^n)^(3/2),x)

[Out]

-2*arctan((-a+b*(c*x)^n)^(1/2)/a^(1/2))/a^(3/2)/n-2/a/n/(-a+b*(c*x)^n)^(1/2)

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Maxima [F]  time = 0., size = 0, normalized size = 0. \begin{align*} \int \frac{1}{{\left (\left (c x\right )^{n} b - a\right )}^{\frac{3}{2}} x}\,{d x} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/x/(-a+b*(c*x)^n)^(3/2),x, algorithm="maxima")

[Out]

integrate(1/(((c*x)^n*b - a)^(3/2)*x), x)

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Fricas [A]  time = 1.5589, size = 378, normalized size = 6.75 \begin{align*} \left [-\frac{{\left (\left (c x\right )^{n} \sqrt{-a} b - \sqrt{-a} a\right )} \log \left (\frac{\left (c x\right )^{n} b + 2 \, \sqrt{\left (c x\right )^{n} b - a} \sqrt{-a} - 2 \, a}{\left (c x\right )^{n}}\right ) + 2 \, \sqrt{\left (c x\right )^{n} b - a} a}{\left (c x\right )^{n} a^{2} b n - a^{3} n}, -\frac{2 \,{\left ({\left (\left (c x\right )^{n} \sqrt{a} b - a^{\frac{3}{2}}\right )} \arctan \left (\frac{\sqrt{\left (c x\right )^{n} b - a}}{\sqrt{a}}\right ) + \sqrt{\left (c x\right )^{n} b - a} a\right )}}{\left (c x\right )^{n} a^{2} b n - a^{3} n}\right ] \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/x/(-a+b*(c*x)^n)^(3/2),x, algorithm="fricas")

[Out]

[-(((c*x)^n*sqrt(-a)*b - sqrt(-a)*a)*log(((c*x)^n*b + 2*sqrt((c*x)^n*b - a)*sqrt(-a) - 2*a)/(c*x)^n) + 2*sqrt(
(c*x)^n*b - a)*a)/((c*x)^n*a^2*b*n - a^3*n), -2*(((c*x)^n*sqrt(a)*b - a^(3/2))*arctan(sqrt((c*x)^n*b - a)/sqrt
(a)) + sqrt((c*x)^n*b - a)*a)/((c*x)^n*a^2*b*n - a^3*n)]

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Sympy [A]  time = 7.75545, size = 44, normalized size = 0.79 \begin{align*} - \frac{2}{a n \sqrt{- a + b \left (c x\right )^{n}}} - \frac{2 \operatorname{atan}{\left (\frac{\sqrt{- a + b \left (c x\right )^{n}}}{\sqrt{a}} \right )}}{a^{\frac{3}{2}} n} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/x/(-a+b*(c*x)**n)**(3/2),x)

[Out]

-2/(a*n*sqrt(-a + b*(c*x)**n)) - 2*atan(sqrt(-a + b*(c*x)**n)/sqrt(a))/(a**(3/2)*n)

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Giac [F]  time = 0., size = 0, normalized size = 0. \begin{align*} \int \frac{1}{{\left (\left (c x\right )^{n} b - a\right )}^{\frac{3}{2}} x}\,{d x} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/x/(-a+b*(c*x)^n)^(3/2),x, algorithm="giac")

[Out]

integrate(1/(((c*x)^n*b - a)^(3/2)*x), x)