cos t + 2 sec t = -3

(t = theta)

I need to determine all solutions of the given equation and express in radian measure.

So far I have:

cos^2 t + cos 0 + 2 = 0

(cost+1)(cost+2)

Then,

cost=-1 cost=-2

cos(-2) will not work, but cos(-1) = 3.14, or Pi. So the only real answer is Pi.

Does this look correct?