find the general solutions to the equations:

Question

1) sec x = -2
2) 2 sin^2 x = 1
3) cos^2 x - 2cos x + 1 = 0

Answer 1

a). secx=-2
2pi/3 and 4pi/3
b). sinx=(2^(1/2)/2
its that value at pi/4, and 3pi/4
c). cosx=+ or - 1, so if they want multiple answers its 0, 2pi, and pi