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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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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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