Question

Cos (n + 1) α .Cos (n – 1)α + Sin (n + 1)α .Sin (n – 1)α =

a) Cos 2nα
b) Sin 2nα
c) Cos 2α
d) Sin 2α

Answer the option​

Answer 1

Answer:

Find intervals in which the Function f(x) = Cos 3x -Cos 2x is increasing /decreasing if X = [ 0, Pi/3]. Then find absolute Maxima and Local Minima in the same interval.