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If A, B , C are angles of a triangle, th...

If `A, B , C `are angles of a triangle, then `P. T sin ^(2) . (A)/(2)+ sin^(2). (B)/(2) - sin ^(2). (C)/(2) =1-2 cos. (A)/(2) cos. (B)/(2) sin .(C)/(2)`

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