Question

Use the squared identities to simplify 2cos^2x cos^2x

A.) 3-4cos(2x)-cos(4x)/4
B.) 3+4cos(2x)-cos(4x)/4
C.) 3+4cos(2x)+cos(4x)/4
D.) 3-4cos(2x)+cos(4x)/4

Answer 1

C.

Explanation:

Answer 2

To simplify the expression, we can check if there are terms that are needed to be added or subtracted. In this case, there are none. we use trigonometric identities to get the simplification equation with this one. The equivalent is 2 (cos 2x ) ^2 equal to C.) 3+4cos(2x)+cos(4x)/4