Test Academy | What will be the value of x + y + z if cos-1 x + cos-1 y + cos-1 z = 3π? -1/3, 1, 3, -3

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What will be the value of x + y + z if cos-1 x + cos-1 y + cos-1 z = 3π?

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-1/3
1
3
-3

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