$$\frac{\cot^3 \theta}{\cosec^2 \theta} + \frac{\tan^3 \theta}{\sec^2 \theta} + 2\sin \theta \cos \theta = ?$$

A

$$\cosec \theta \sec \theta$$

B

$$\sin \theta \cos \theta$$

C

$$\cosec^2 \theta \sec^2 \theta$$

D

$$\sin^2 \theta \cos \theta$$