1) Let O be the origin and OX, OY, OZ be three unit vectors in the directions of the sides QR,RP,PQ respectively of triangle PQR. (ox × oy)= A) sin(P+Q) B) sin(P+R) C) Sin(Q+R) D) sin2R Answer: Option AExplanation:$\sin R=\sin(P+Q)$
