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If cos^-1x+cos^-1y+cos^-1z=3pi, then xy+...

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

A

-3

B

0

C

3

D

-1

Text Solution

Verified by Experts

The correct Answer is:
C
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