Integrand size = 18, antiderivative size = 20 \[ \int \sqrt {1-x} x \sqrt {1+x} \, dx=-\frac {1}{3} (1-x)^{3/2} (1+x)^{3/2} \]
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Time = 0.00 (sec) , antiderivative size = 20, normalized size of antiderivative = 1.00, number of steps used = 1, number of rules used = 1, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.056, Rules used = {75} \[ \int \sqrt {1-x} x \sqrt {1+x} \, dx=-\frac {1}{3} (1-x)^{3/2} (x+1)^{3/2} \]
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Rule 75
Rubi steps \begin{align*} \text {integral}& = -\frac {1}{3} (1-x)^{3/2} (1+x)^{3/2} \\ \end{align*}
Time = 0.00 (sec) , antiderivative size = 15, normalized size of antiderivative = 0.75 \[ \int \sqrt {1-x} x \sqrt {1+x} \, dx=-\frac {1}{3} \left (1-x^2\right )^{3/2} \]
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Time = 1.44 (sec) , antiderivative size = 15, normalized size of antiderivative = 0.75
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 | \(-\frac {\sqrt {\left (1+x \right ) \left (1-x \right )}\, \sqrt {1+x}\, \left (x^{2}-1\right ) \left (-1+x \right )}{3 \sqrt {1-x}\, \sqrt {-\left (-1+x \right ) \left (1+x \right )}}\) | \(44\) |
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none
Time = 0.22 (sec) , antiderivative size = 19, normalized size of antiderivative = 0.95 \[ \int \sqrt {1-x} x \sqrt {1+x} \, dx=\frac {1}{3} \, {\left (x^{2} - 1\right )} \sqrt {x + 1} \sqrt {-x + 1} \]
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\[ \int \sqrt {1-x} x \sqrt {1+x} \, dx=\int x \sqrt {1 - x} \sqrt {x + 1}\, dx \]
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none
Time = 0.30 (sec) , antiderivative size = 11, normalized size of antiderivative = 0.55 \[ \int \sqrt {1-x} x \sqrt {1+x} \, dx=-\frac {1}{3} \, {\left (-x^{2} + 1\right )}^{\frac {3}{2}} \]
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Leaf count of result is larger than twice the leaf count of optimal. 43 vs. \(2 (14) = 28\).
Time = 0.29 (sec) , antiderivative size = 43, normalized size of antiderivative = 2.15 \[ \int \sqrt {1-x} x \sqrt {1+x} \, dx=\frac {1}{6} \, {\left ({\left (2 \, x - 5\right )} {\left (x + 1\right )} + 9\right )} \sqrt {x + 1} \sqrt {-x + 1} + \frac {1}{2} \, \sqrt {x + 1} {\left (x - 2\right )} \sqrt {-x + 1} \]
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Time = 1.11 (sec) , antiderivative size = 19, normalized size of antiderivative = 0.95 \[ \int \sqrt {1-x} x \sqrt {1+x} \, dx=\frac {\left (x^2-1\right )\,\sqrt {1-x}\,\sqrt {x+1}}{3} \]
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