Optimal. Leaf size=53 \[ 8 x \sqrt {a+a \cos (x)}-16 \sqrt {a+a \cos (x)} \tan \left (\frac {x}{2}\right )+2 x^2 \sqrt {a+a \cos (x)} \tan \left (\frac {x}{2}\right ) \]
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Rubi [A]
time = 0.06, antiderivative size = 53, normalized size of antiderivative = 1.00, number of steps
used = 4, number of rules used = 3, integrand size = 14, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.214, Rules used = {3400, 3377,
2717} \begin {gather*} 2 x^2 \tan \left (\frac {x}{2}\right ) \sqrt {a \cos (x)+a}+8 x \sqrt {a \cos (x)+a}-16 \tan \left (\frac {x}{2}\right ) \sqrt {a \cos (x)+a} \end {gather*}
Antiderivative was successfully verified.
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Rule 2717
Rule 3377
Rule 3400
Rubi steps
\begin {align*} \int x^2 \sqrt {a+a \cos (x)} \, dx &=\left (\sqrt {a+a \cos (x)} \sec \left (\frac {x}{2}\right )\right ) \int x^2 \cos \left (\frac {x}{2}\right ) \, dx\\ &=2 x^2 \sqrt {a+a \cos (x)} \tan \left (\frac {x}{2}\right )-\left (4 \sqrt {a+a \cos (x)} \sec \left (\frac {x}{2}\right )\right ) \int x \sin \left (\frac {x}{2}\right ) \, dx\\ &=8 x \sqrt {a+a \cos (x)}+2 x^2 \sqrt {a+a \cos (x)} \tan \left (\frac {x}{2}\right )-\left (8 \sqrt {a+a \cos (x)} \sec \left (\frac {x}{2}\right )\right ) \int \cos \left (\frac {x}{2}\right ) \, dx\\ &=8 x \sqrt {a+a \cos (x)}-16 \sqrt {a+a \cos (x)} \tan \left (\frac {x}{2}\right )+2 x^2 \sqrt {a+a \cos (x)} \tan \left (\frac {x}{2}\right )\\ \end {align*}
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Mathematica [A]
time = 0.03, size = 29, normalized size = 0.55 \begin {gather*} 8 \sqrt {a (1+\cos (x))} \left (x+\frac {1}{4} \left (-8+x^2\right ) \tan \left (\frac {x}{2}\right )\right ) \end {gather*}
Antiderivative was successfully verified.
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Maple [C] Result contains complex when optimal does not.
time = 0.06, size = 70, normalized size = 1.32
method | result | size |
risch | \(-\frac {i \sqrt {2}\, \sqrt {a \left ({\mathrm e}^{i x}+1\right )^{2} {\mathrm e}^{-i x}}\, \left (4 i x \,{\mathrm e}^{i x}+x^{2} {\mathrm e}^{i x}+4 i x -x^{2}-8 \,{\mathrm e}^{i x}+8\right )}{{\mathrm e}^{i x}+1}\) | \(70\) |
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [A]
time = 0.52, size = 36, normalized size = 0.68 \begin {gather*} 2 \, {\left (\sqrt {2} x^{2} \sin \left (\frac {1}{2} \, x\right ) + 4 \, \sqrt {2} x \cos \left (\frac {1}{2} \, x\right ) - 8 \, \sqrt {2} \sin \left (\frac {1}{2} \, x\right )\right )} \sqrt {a} \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [F(-2)]
time = 0.00, size = 0, normalized size = 0.00 \begin {gather*} \text {Exception raised: TypeError} \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [F]
time = 0.00, size = 0, normalized size = 0.00 \begin {gather*} \int x^{2} \sqrt {a \left (\cos {\left (x \right )} + 1\right )}\, dx \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [A]
time = 0.43, size = 43, normalized size = 0.81 \begin {gather*} 2 \, \sqrt {2} {\left (4 \, x \cos \left (\frac {1}{2} \, x\right ) \mathrm {sgn}\left (\cos \left (\frac {1}{2} \, x\right )\right ) + {\left (x^{2} \mathrm {sgn}\left (\cos \left (\frac {1}{2} \, x\right )\right ) - 8 \, \mathrm {sgn}\left (\cos \left (\frac {1}{2} \, x\right )\right )\right )} \sin \left (\frac {1}{2} \, x\right )\right )} \sqrt {a} \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Mupad [B]
time = 0.34, size = 70, normalized size = 1.32 \begin {gather*} \frac {2\,\sqrt {a}\,\sqrt {\cos \left (x\right )+1}\,\left (x^2\,\cos \left (x\right )-8\,\cos \left (x\right )-4\,x\,\sin \left (x\right )-x^2+8+x\,4{}\mathrm {i}-\sin \left (x\right )\,8{}\mathrm {i}+x^2\,\sin \left (x\right )\,1{}\mathrm {i}+x\,\cos \left (x\right )\,4{}\mathrm {i}\right )}{\cos \left (x\right )\,1{}\mathrm {i}-\sin \left (x\right )+1{}\mathrm {i}} \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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