Which of the following is equal to Im(1z2)\text{Im}(\frac{1}{z^2})Im(z21) if ∣z∣=1|z|=1∣z∣=1 and z=eiθz=e^{i\theta}z=eiθ?
−sin(2θ)-\sin(2\theta)−sin(2θ)
sin(2θ)\sin(2\theta)sin(2θ)
−cos(2θ)-\cos(2\theta)−cos(2θ)
cos(2θ)\cos(2\theta)cos(2θ)