At which values in the intervall [0,2π ) will the functions f(x)=2sin²θ and g(x)=-1+4sin θ -2sin²θ intersect?
a θ = π /6 , 7π /6
b θ = π /6 , 5π /6
c θ = 5π /6 , 11π /6
d θ = 5π /6 , 11π /6