(a) Find the volume of the sphere $x^{2}+y^{2}+z^{2}=a^{2}$.
Explanation
The volume of a sphere is given by the formula $V = \frac{4}{3} \pi r^{3}$, where $r$ is the radius of the sphere. In this case, the radius of the sphere is $a$, so the volume is $V = \frac{4}{3} \pi a^{3}$.
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