If `x=rsinthetacosphi,y=rsinthetasinphi and z=rcostheta, then x^2+y^2+z^2` is independent of `theta,phi` (b) `r ,theta` (c) `r ,phi` (d) r

Explanation

To solve the problem, we need to calculate \( x^2 + y^2 + z^2 \) given the expressions for \( x \), \( y \), and \( z \).

1. **Given Expressions:**
\[ x = r \sin \theta \cos \phi \]
\[
y = r \sin \theta \sin \phi
...