3.9.49 \(\int \sqrt {1-x} x \sqrt {1+x} \, dx\) [849]

Optimal. Leaf size=20 \[ -\frac {1}{3} (1-x)^{3/2} (1+x)^{3/2} \]

[Out]

-1/3*(1-x)^(3/2)*(1+x)^(3/2)

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Rubi [A]
time = 0.00, antiderivative size = 20, normalized size of antiderivative = 1.00, number of steps used = 1, number of rules used = 1, integrand size = 18, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.056, Rules used = {75} \begin {gather*} -\frac {1}{3} (1-x)^{3/2} (x+1)^{3/2} \end {gather*}

Antiderivative was successfully verified.

[In]

Int[Sqrt[1 - x]*x*Sqrt[1 + x],x]

[Out]

-1/3*((1 - x)^(3/2)*(1 + x)^(3/2))

Rule 75

Int[((a_.) + (b_.)*(x_))*((c_.) + (d_.)*(x_))^(n_.)*((e_.) + (f_.)*(x_))^(p_.), x_Symbol] :> Simp[b*(c + d*x)^
(n + 1)*((e + f*x)^(p + 1)/(d*f*(n + p + 2))), x] /; FreeQ[{a, b, c, d, e, f, n, p}, x] && NeQ[n + p + 2, 0] &
& EqQ[a*d*f*(n + p + 2) - b*(d*e*(n + 1) + c*f*(p + 1)), 0]

Rubi steps

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

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Mathematica [A]
time = 0.00, size = 15, normalized size = 0.75 \begin {gather*} -\frac {1}{3} \left (1-x^2\right )^{3/2} \end {gather*}

Antiderivative was successfully verified.

[In]

Integrate[Sqrt[1 - x]*x*Sqrt[1 + x],x]

[Out]

-1/3*(1 - x^2)^(3/2)

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Maple [A]
time = 0.10, size = 20, normalized size = 1.00

method	result	size
gosper	\(-\frac {\left (1-x \right )^{\frac {3}{2}} \left (1+x \right )^{\frac {3}{2}}}{3}\)	\(15\)
default	\(\frac {\sqrt {1-x}\, \sqrt {1+x}\, \left (x^{2}-1\right )}{3}\)	\(20\)
risch	\(-\frac {\sqrt {\left (1+x \right ) \left (1-x \right )}\, \sqrt {1+x}\, \left (x^{2}-1\right ) \left (-1+x \right )}{3 \sqrt {1-x}\, \sqrt {-\left (1+x \right ) \left (-1+x \right )}}\)	\(44\)

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(x*(1-x)^(1/2)*(1+x)^(1/2),x,method=_RETURNVERBOSE)

[Out]

1/3*(1-x)^(1/2)*(1+x)^(1/2)*(x^2-1)

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Maxima [A]
time = 0.52, size = 11, normalized size = 0.55 \begin {gather*} -\frac {1}{3} \, {\left (-x^{2} + 1\right )}^{\frac {3}{2}} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

-1/3*(-x^2 + 1)^(3/2)

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Fricas [A]
time = 0.56, size = 19, normalized size = 0.95 \begin {gather*} \frac {1}{3} \, {\left (x^{2} - 1\right )} \sqrt {x + 1} \sqrt {-x + 1} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

1/3*(x^2 - 1)*sqrt(x + 1)*sqrt(-x + 1)

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Sympy [B] Leaf count of result is larger than twice the leaf count of optimal. 58 vs. \(2 (15) = 30\).
time = 21.53, size = 129, normalized size = 6.45 \begin {gather*} - 2 \left (\begin {cases} \frac {x \sqrt {1 - x} \sqrt {x + 1}}{4} + \frac {\operatorname {asin}{\left (\frac {\sqrt {2} \sqrt {x + 1}}{2} \right )}}{2} & \text {for}\: \sqrt {x + 1} > - \sqrt {2} \wedge \sqrt {x + 1} < \sqrt {2} \end {cases}\right ) + 2 \left (\begin {cases} \frac {x \sqrt {1 - x} \sqrt {x + 1}}{4} - \frac {\left (1 - x\right )^{\frac {3}{2}} \left (x + 1\right )^{\frac {3}{2}}}{6} + \frac {\operatorname {asin}{\left (\frac {\sqrt {2} \sqrt {x + 1}}{2} \right )}}{2} & \text {for}\: \sqrt {x + 1} > - \sqrt {2} \wedge \sqrt {x + 1} < \sqrt {2} \end {cases}\right ) \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

-2*Piecewise((x*sqrt(1 - x)*sqrt(x + 1)/4 + asin(sqrt(2)*sqrt(x + 1)/2)/2, (sqrt(x + 1) < sqrt(2)) & (sqrt(x +
1) > -sqrt(2)))) + 2*Piecewise((x*sqrt(1 - x)*sqrt(x + 1)/4 - (1 - x)**(3/2)*(x + 1)**(3/2)/6 + asin(sqrt(2)*
sqrt(x + 1)/2)/2, (sqrt(x + 1) < sqrt(2)) & (sqrt(x + 1) > -sqrt(2))))

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Giac [B] Leaf count of result is larger than twice the leaf count of optimal. 43 vs. \(2 (14) = 28\).
time = 1.57, size = 43, normalized size = 2.15 \begin {gather*} \frac {1}{6} \, {\left ({\left (2 \, x - 5\right )} {\left (x + 1\right )} + 9\right )} \sqrt {x + 1} \sqrt {-x + 1} + \frac {1}{2} \, \sqrt {x + 1} {\left (x - 2\right )} \sqrt {-x + 1} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

1/6*((2*x - 5)*(x + 1) + 9)*sqrt(x + 1)*sqrt(-x + 1) + 1/2*sqrt(x + 1)*(x - 2)*sqrt(-x + 1)

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Mupad [B]
time = 1.09, size = 19, normalized size = 0.95 \begin {gather*} \frac {\left (x^2-1\right )\,\sqrt {1-x}\,\sqrt {x+1}}{3} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(x*(1 - x)^(1/2)*(x + 1)^(1/2),x)

[Out]

((x^2 - 1)*(1 - x)^(1/2)*(x + 1)^(1/2))/3

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