A) -1/2 or *0.5
B) - [tex]\frac{\sqrt{3}}{2}[/tex]
C) 1
D) θ = π 4 + 2 π n , 3 π 4 + 2 π n
E) θ = 2 π 3 + 2 π n , 4 π 3 + 2 π n
