Math ECAT Exams Quizzes MCQs Quizzes Trigonometric Identities Test

Question:
cos (α - β) =

Option A):
sin α cos β – cos α sin β
Option B):
sin α cos β + cos α sin β
Option C):
cos α cos β + sin α sin β
Option D):
cos α cos β – sin α sin β

Correct Answer is Option C):
cos α cos β + sin α sin β