`cos^(2) (A-B)+cos^(2)B-2cos(A-B) cos A cos B = `

Prove that : sin^2 A=cos^2 (A-B)+ cos^2 B-2 cos (A - B) cos A cos B .

Value of cos^2(A - B) + cos^2 B - 2 cos (A-B) cos Acos B is:

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

Prove the following that: sin^2A=cos^2(A-B)+cos^2B-2cos(A-B)cosAcosBdot

Prove that: sin^2A=cos^2(A-B)+cos^2B-2cos(A-B)cosAcosBdot

Show that cos^(2) A + cos^(2)B - 2 cos A cos B cos (A + B) = sin^(2) (A + B)

If A+C+B=180, then the value of (cos ^(2) A+ cos ^(2) B +cos ^(2) C-2 cos A cos B cos C) is-

If A+B+C=(3pi)/(2) , prove that cos ^(2)A+ cos ^(2) B- cos ^(2)C=-2 cos A cos B sin C.