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[" 27.सिद्ध कीजिए कि "cos^(2)A+cos^(2)B-...

[" 27.सिद्ध कीजिए कि "cos^(2)A+cos^(2)B-2cos A cos B],[cos(A+B)=sin^(2)(A+B)]

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

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

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

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

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

sin^(2)A cos^(2)B-cos^(2)A sin^(2)B=sin^(2)A-sin^(2)B

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

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

If A-B=(2n+1)(pi)/(2) , n in Z ,then [[cos^(2)A,cos A sin A],[cos A sin A,sin^(2)A]][[cos^(2)B,cos B sin B],[cos B sin B,sin^(2)B]]=