If \( \cos ^{-1} p+\cos ^{-1} q+\cos ^{-1} r=\pi \). Then value of \( p^{2}+q^{2}+r^{2} \) +2 pq...
If \( \cos ^{-1} p+\cos ^{-1} q+\cos ^{-1} r=\pi \). Then value of \( p^{2}+q^{2}+r^{2} \) +2 pqr +4 is equal to-
(a) 1
(b) 0
(c) 5
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