If cos^(-1)x + cos^(-1)y + cos^(-1)z = 3...

If `cos^(-1)x + cos^(-1)y + cos^(-1)z = 3pi,` then `xy + yz +zx` is equal to

A

(a) 0

B

(b) 1

C

(c) 3

D

(d) `-3`

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The correct Answer is:

C

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