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Integrate[x^3*Sqrt[(a^2 - x^2)^3], x] ==
(Sqrt[(a^2 - x^2)^3]*(-a^2 + x^2)*(2*a^2 + 5*x^2))/35
3 2 2 3 Integrate[x Sqrt[(a - x ) ], x] ==
2 2 3 2 2 2 2
Sqrt[(a - x ) ] (-a + x ) (2 a + 5 x )
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35
Time to compute: 0.07 second
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