Inverse Trigonometric FunctionMedium
Question
If cos-1 x + cos-1 y + cos-1 z = π, then -
Options
A.x2 + y2 + z2 + xyz = 0
B.x2 + y2 + z2 + xyz = 1
C.x2 + y2 + z2 + 2xyz = 0
D.x2 + y2 + z2 + 2xyz = 1
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