Question

Given cosine of x is equal to one half comma what is the value of cos(x + π)?

A. square root of 3 over 2
B. negative square root of 3 over 2
C. one half
D. negative one half

Answer 1

Answer:

D.  negative one half

Step-by-step explanation:

trigonometric Formula :

cos(x + π) = − cos(x)

………………………………………

We are given , cos(x) = 1/2

Since , cos(x + π) = − cos(x)

then

cos(x + π) = − 1/2