Question

Solve the equation:
cos^2 (x) - cos (x) = 2 in the domain of 0 11 years ago

Answer 1

let cosx = t, then
t^2-t-2=0
t=2 and t=-1
ofcource t=2 is not a valid solution since |cosx|<1
so cosx =-1 that means x=?

Answer 2

x = pi?

Answer 3

I would very much like to see you factor and solve one of these. Otherwise, I have no convincing evidence that you are effectively completing your assignment.