3.154 \(\int \frac{1}{x^3 (b x^n)^{3/2}} \, dx\)

Optimal. Leaf size=28 \[ -\frac{2 x^{-n-2}}{b (3 n+4) \sqrt{b x^n}} \]

[Out]

(-2*x^(-2 - n))/(b*(4 + 3*n)*Sqrt[b*x^n])

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Rubi [A]  time = 0.0069323, antiderivative size = 28, normalized size of antiderivative = 1., number of steps used = 2, number of rules used = 2, integrand size = 13, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.154, Rules used = {15, 30} \[ -\frac{2 x^{-n-2}}{b (3 n+4) \sqrt{b x^n}} \]

Antiderivative was successfully verified.

[In]

Int[1/(x^3*(b*x^n)^(3/2)),x]

[Out]

(-2*x^(-2 - n))/(b*(4 + 3*n)*Sqrt[b*x^n])

Rule 15

Int[(u_.)*((a_.)*(x_)^(n_))^(m_), x_Symbol] :> Dist[(a^IntPart[m]*(a*x^n)^FracPart[m])/x^(n*FracPart[m]), Int[
u*x^(m*n), x], x] /; FreeQ[{a, m, n}, x] &&  !IntegerQ[m]

Rule 30

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

Rubi steps

\begin{align*} \int \frac{1}{x^3 \left (b x^n\right )^{3/2}} \, dx &=\frac{x^{n/2} \int x^{-3-\frac{3 n}{2}} \, dx}{b \sqrt{b x^n}}\\ &=-\frac{2 x^{-2-n}}{b (4+3 n) \sqrt{b x^n}}\\ \end{align*}

Mathematica [A]  time = 0.0066354, size = 22, normalized size = 0.79 \[ \frac{1}{\left (-\frac{3 n}{2}-2\right ) x^2 \left (b x^n\right )^{3/2}} \]

Antiderivative was successfully verified.

[In]

Integrate[1/(x^3*(b*x^n)^(3/2)),x]

[Out]

1/((-2 - (3*n)/2)*x^2*(b*x^n)^(3/2))

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Maple [A]  time = 0.002, size = 20, normalized size = 0.7 \begin{align*} -2\,{\frac{1}{{x}^{2} \left ( 4+3\,n \right ) \left ( b{x}^{n} \right ) ^{3/2}}} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(1/x^3/(b*x^n)^(3/2),x)

[Out]

-2/x^2/(4+3*n)/(b*x^n)^(3/2)

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Maxima [F(-2)]  time = 0., size = 0, normalized size = 0. \begin{align*} \text{Exception raised: ValueError} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

Exception raised: ValueError

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Fricas [F(-2)]  time = 0., size = 0, normalized size = 0. \begin{align*} \text{Exception raised: UnboundLocalError} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

Exception raised: UnboundLocalError

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Sympy [F(-2)]  time = 0., size = 0, normalized size = 0. \begin{align*} \text{Exception raised: TypeError} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/x**3/(b*x**n)**(3/2),x)

[Out]

Exception raised: TypeError

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

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

integrate(1/((b*x^n)^(3/2)*x^3), x)