Respuesta :
Answer:
The answer is 1/8 or C.
Step-by-step explanation:
I know this is correct because I got it right on edge 2021.
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.The value of cos(2x) is 1/8
What is Trigonometry?
Trigonometry is a branch of mathematics that studies relationships between the sides and angles of triangles.
Given:
cos x = 3/4
Using identity,
cos 2x = 2 cos^2 (x)-1
=2(3/4*3/4)-1
=2*9/16-1
=9/8-1
=1/8.
Learn more about trigonometry here:
https://brainly.com/question/26719838
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