Question

Is it right to say that cos(60°+30°)
=Cos 60° cos 30° - Sin 60° Sin 30°​

Answer 1

Step-by-step explanation:

cos(60°+30°) = Cos 60° Cos 30° -- Sin 60° Sin 30°

using, Cos(A+B) = Cos A Cos B -- Sin A Sin B

Therefore, it is right to say that Cos(60°+30°) = Cos 60° Cos 30° -- Sin 60° Sin 30°