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If P,Q,R are angles of DeltaPQR then |[-...

If `P,Q,R` are angles of `DeltaPQR` then `|[-1,cosR,cosQ] , [cosR,-1,cosP] , [cosQ,cosP,-1]|` is equal to (A) `-1` (B) 0 (C) `1/2` (D) 1

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