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  4. If Cos-1 p + Cos -1 q + Cos -1 r = π then p2 + q2 +r2 +2pqr=

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Q. If $Cos^{-1} p + Cos ^{-1} q + Cos ^{-1} r = \pi $ then $p^{2} + q^{2} +r^{2} +2pqr=$

KCETKCET 2004

Solution:

Correct answer is (b) 1