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If x=rsinthetacosphi,y=rsinthetasinphi ...

If `x=rsinthetacosphi,y=rsinthetasinphi and z=rcostheta`, then `x^2+y^2+z^2` is independent of

A

(a) `theta,varphi`

B

(b) `r ,theta`

C

(c) `r ,varphi`

D

(d) `r`

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