Question

Which expression is equivalent to cos(4x) + cos(2x)?

Answer 1

@3mar

Answer 2

Well, I am here.

Answer 3

Do it with my pencil and paper and deliver it or you have choices you would choose from them!?

Answer 4

Do I plug the numbers in to the equations you gave me?

Answer 5

Its multiple choice

Answer 6

Why not use double angle formulas and see where it leads?

Answer 7

Ok.
so you mean the third equation in the photo I sent you?

Answer 8

Is that what you mean?

Answer 9

What is that @tkhunny?

Answer 10

Yes @3mar would I use that equation?

Answer 11

I got this \[2\cos (3x) \cos (x)\] when I used the equation

Answer 12

Yes, that is how you approach your right answer, and this is what @tkhunny means also!

Answer 13

\[\Huge\color{RebeccaPurple }\checkmark\]
You hit the right target!
Congratulations!