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

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

Posted by Gurvinder Singh 7 years, 4 months ago

CBSE > Class 10 > Mathematics

5 answers

Gurvinder Singh 7 years, 4 months ago

LHS cos (a+b) cos (a-b) (cosa.cosb-sina.sinb)(cosa.cosb+sina.sinb) (cosa.cosb)^2-(sina.sinb)^2 cos^2a.cos^2b-sin^2a.sin^2b cos^2a (1-sin^2b)-(1-cos^2a) sin^2b cos^2a-cos^2a.sin^2b-sin^2b+cos^2a.sin^2b Cos^2a-sin^2b PROOVED

0Thank You

Nishant Verma 7 years, 4 months ago

Q. Uncomplete lag Raha hai

0Thank You

Cutiee Princess 7 years, 4 months ago

If it is possible then i too want its answer

0Thank You

Cutiee Princess 7 years, 4 months ago

(Cos a + cos b ) ( cos a - cos b ) = cos ^ 2 a - cos ^ 2 b = 1 + sin ^ 2 a - cos ^ 2 b Not possible

0Thank You

Srishti Maurya 7 years, 4 months ago

?????

3Thank You

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CBSE > Class 10 > Mathematics