How do you solve 4\cos x = 1+ 2\cos x?

1 Answer
Mar 5, 2017

x=pi/3

Explanation:

Rearrange to get all the cos over on one side.

4cosx=1+2cosx

2cosx=1

and now get it on its own by dividing by 2,

cosx = 1/2

Now you can do an inverse function to find x:

cosx = 1/2 -> cos^-1(1/2) = x

x = pi/3