Question

If cos(x) = Three-fourths and tan(x) < 0, what is cos(2x)?.

Answer 1

Answer:C

Step-by-step explanation:

did it on edge

Answer 2

Recall the double angle identity for cosine,

cos(2x) = 2 cos²(x) - 1

Then

cos(2x) = 2 (3/4)² - 1 = 1/8