o) यदि \cos ^{-1} x+\cos ^{-1} y+\cos ^{-1} z=\pi. तो सि – InterviewSolution

1.	o) यदि \cos ^{-1} x+\cos ^{-1} y+\cos ^{-1} z=\pi. तो सिद्ध कीजिए किx^{2}+y^{2}+z^{2}+2 x y z=1
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