Question

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. $-1$

Answer 1

Answer: (B)

1

Answer 2

Answer (b) 1