Q.2454 : यदि x = r sin A cos B, y = r sin A sin B तथा z = r cos A हो तो x² + y² + z² = ?

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Q.2454 : यदि x = r sin A cos B, y = r sin A sin B तथा z = r cos A हो तो x² + y² + z² = ?
(a) 3r²
(b) r³
(c) r²
(d) 3 r

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Answer :r²