If \( x=r \sin \theta \cos \phi, y=r \sin \theta \sin \phi \), \( z...

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If \( x=r \sin \theta \cos \phi, y=r \sin \theta \sin \phi \), \( z=r \cos \theta \), prove that \( x^{2}+y^{2}+z^{2}=r^{2} \)
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