If A,B,C are angles of triangle,then prove that Sin.sinA/2+sin.sinB/2-sin.sinC/2=1-2cosA/2cosB/2sinC/2
If A,B,C are angles of triangle,then prove that Sin.sinA/2+sin.sinB/2-sin.sinC/2=1-2cosA/2cosB/2sinC/2
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