If x-rsin-cos- y-rsin-sin- and z-rcos- prove that r2-x2-y2-z2-

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Complex Numbers

If x=rsinαc...

Question

If $x = r sin α cos β, y = r sin α sin β$ and $z = r cos α$ , prove that $r^{2} = x^{2} + y^{2} + z^{2}$ .

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