Cos(a+b) cos (a-b)= cos^2a-sin^2b
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LHScos (a+b) cos (a-b)(cosa.cosb-sina.sinb)(cosa.cosb+sina.sinb)(cosa.cosb)^2-(sina.sinb)^2cos^2a.cos^2b-sin^2a.sin^2bcos^2a (1-sin^2b)-(1-cos^2a) sin^2bcos^2a-cos^2a.sin^2b-sin^2b+cos^2a.sin^2bCos^2a-sin^2b PROOVED
Q. Uncomplete lag Raha hai
If it is possible then i too want its answer
(Cos a + cos b ) ( cos a – cos b ) = cos ^ 2 a – cos ^ 2 b = 1 + sin ^ 2 a – cos ^ 2 b Not possible
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