What is the Formula of 2 Cos A Cos B ?
Solution : The formula of 2 cos A cos B is cos (A + B) + cos (A – B). Example : Solve : 2 cos 75 cos 15. Solution : We have, 2 cos 75 cos 15 = cos (75 + 15) + cos (75 – 15) = cos 90 + cos 60 = […]
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