Verify That Each Equation Is an Identity $2 \csc ^{2} \theta=\frac{1}{1-\cos \theta}+\frac{1}{1+\cos \theta}$

Verify that each equation is an identity.
- $2 \csc ^{2} \theta=\frac{1}{1-\cos \theta}+\frac{1}{1+\cos \theta}$