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Cos(a+b) cos (a-b)= cos^2a-sin^2b |
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Answer» 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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