(b-a cos c)sin A=a cos A sin c

cos2a-cos2b + cos2c = 1-4sin a cos b sin c

In any triangle ABC,sin^(2)A-sin^(2)B+sin^(2)C is always equal to (A) 2sin A sin B cos C(B)2sin A cos B sin C(C)2sin A cos B cos C(D)2sin A sin B sin C

Prove that sin(A+B+C)=sin A cos B cos C+cos A sin B cos C+cos A cos B sin C-sin A sin B sin Ccos(A+B+C)=cos A cos B cos C-cos A sin B sin C-sin A cos B sin C-sin A sin B cos C

Prove that a cos A+b cos B+c cos C=4R sin A sin B sin C

If : A+B+C=pi, "then" : 1-cos^(2) A-cos^(2)B-cos^(2)C= A) 2 cos A * cos B * cos C B) 2 sin A * cos B * cos C C) 2 cos A * sin B * cos C D) 2 cos A * cos B * sin C

For any triangle ABC,prove that a cos A+b cos B+c cos C=2a sin B sin C

In any triangle ABC, prove that: a cos A+b cos B+c cos C=2a sin B sin C

In any Delta ABC, prove that :a cos A+b cos B+c cos C=2a sin B sin C

If A,B, C are the angles of a triangle ABC then (cos A+i sin A)(cos B+i sin B)(cos C+i sin C)

In any triangle ABC, prove that following: quad a cos A=b cos B=c cos C=2b sin A sin C=2c sin A sin B