If $$\sec(5 \alpha - 15^\circ) = \cosec(15^\circ - 2 \alpha)$$, then the value of $$\cos \alpha + \sin 2 \alpha + \tan(1.5 \alpha)$$ is:

A

$$\sqrt{3} + 1$$

B

$$\sqrt{2} - 1$$

C

$$\sqrt{3} - 1$$

D

$$\sqrt{2} + 1$$