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shakeel123

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Registered: 2017-09-21

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cos (α + β) =?

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

Correct Answer is Option D):
cos α cos β – sin α sin β

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