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If cos^(-1)p+cos^(-1)q+cos^(-1)r=pi then...

If `cos^(-1)p+cos^(-1)q+cos^(-1)r=pi` then `p^(2)+q^(2)+r^(2)+2pqr`=

A

3

B

1

C

2

D

`-1`

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The correct Answer is:
B
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