How can I obtain from mathematica an exact solution to an Integral of the form $ \int _0^a x_1^2dx_1\int_0^{\sqrt{a^2-x_1^2}}x_2^2dx_2\int_0^{\sqrt{a^2-x_1^2-x_2^2}}x_3^2dx_3 $ And is it possible to ...

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