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Question Number 20616 by virus last updated on 29/Aug/17

$$x=r\cos \theta \cos \mathrm{\varnothing },y=r\sin \theta \sin \mathrm{\varnothing },z=\sin \theta$$$$thenprovethat{x}^2+y^2+z^2=r^2$$

Commented by virus last updated on 01/Sep/17

$$pleasesolvethis$$

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