If \( x=r \sin \theta \cdot \cos \phi, y=r \sin \theta \cdot \sin \phi \) and \( z=r \cos \theta...
If \( x=r \sin \theta \cdot \cos \phi, y=r \sin \theta \cdot \sin \phi \) and \( z=r \cos \theta \) then the value of \( x^{2}+y^{2}+z^{2} \) is independent of
(a) \( \theta, \phi \)
(b) \( r, \theta \)
(c) \( r, \phi \)
(d) \( r \)
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