If A, B , C are angles in a triangle, then prove that `sin ^(2)A+ sin ^(2)B+sin^(2)C=2+2 cos A cos B cos C`

If A,B, C are angles in a triangle, then prove that: sin^(2) A + sin^(2) B - sin^(2) C =2 sin A sin B cos C

If A, B , C are angles in a triangle, then the sin ^(2)A+sin ^(2)B - sin ^(2) C =2 sin A sin B cos C

If A, B, C are angles in a triangle , then prove that cos^(2)A+cos^(2)B-cos^(2)C=1-2sin Asin Bcos C.

If A , B , C are angles in a triangle , then prove that sin A + sin B + sin C =4 cos. (A)/(2) cos . (B)/(2) cos .(C)/(2)

If A, B, C are angles of a triangle, then prove that sin^(2)""A/2+sin^(2)""B/2-sin^(2)""C/2=1-2cos""A/2cos""B/2sin""C/2 .

If A+B+C=pi, prove that sin^(2)A+sin^(2)B+sin^(2)C=2(1+cos A cos B cos C)

If A B C are the angles of a triangle then sin ^(2) A+sin ^(2) B+sin ^(2) C-2 cos A cos B cos C

If A,B,C are angles of a triangle, prove that sin((B+C)/2)="cos"A/2

If A, B, C are angles of a triangle , prove that sin 2A+sin 2B-sin 2C=4cos Acos B sin C