Question

cos^2x+2cos x=3

Answer 1

what are you trying to do with this? looks like a quadratic equation with trig functions.

Answer 2

it's working with trig equations

Answer 3

what answer are you looking for though. are you wanting to factor that? and find the roots like a quadratic equation? what is the subheader on the system of problems

Answer 4

I want it to be solved, like i don't know how to do the first step

Answer 5

well. I would subtract the 3 from both sides then you have something that looks like
\[x^2+2x-3\]
only using trig functions

Answer 6

= to 0 of course