1.

Let p, q and r denote the lengths of the sides QR, PR and PQ of a triangle PQR respectively. Then p cos2(R/2)+r cos2(P/2)

Answer»

Let p, q and r denote the lengths of the sides QR, PR and PQ of a triangle PQR respectively. Then p cos2(R/2)+r cos2(P/2)




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