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JEE Main 2021Medium

Q.If $\cos^{-1} x + \cos^{-1} y + \cos^{-1} z = \pi$ , then the value of $x^2 + y^2 + z^2 + 2xyz$ is

a

1

b

0

c

-1

d

2

Correct Answer: Option A

The correct solution involves applying the fundamental concept to derive the final value step by step...

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