Identity alpha and beta in the following expression which is

Identity alpha and beta in the following expression which is the right side of the formula for cos(alpha - beta) cos (175 degree) cos (55 degree) + sin (175 degree) sin (55 degree) alpha = 175 degree, beta = 55 degree alpha = -175 degree, beta = 55 degree alpha = 55 degree, beta = 175 degree alpha = -55 degree, beta = 175 degree

Solution

Solution:

Given

Cos(175) Cos(55) + SIn(175) Sin(55) .... 1

as we know that

Cos(A-B) = Cos(A) Cos(B) + SIn(A) Sin(B) ... 2

As we compare form 1 and 2

Cos(A-B) = (Cos 175 - 55)

therefore

A = 175 and B = 55

Option (A) is correct

Answer