Which of the following is equivalent to Re(1z2)\text{Re}(\frac{1}{z^2})Re(z21) given ∣z∣=1|z|=1∣z∣=1 and z=eiθz=e^{i\theta}z=eiθ?
cos(2θ)\cos(2\theta)cos(2θ)
sin(2θ)\sin(2\theta)sin(2θ)
cos(θ2)\cos(\theta^2)cos(θ2)
−cos(2θ)-\cos(2\theta)−cos(2θ)