If $$\left(x - \frac{1}{x}\right) = 6$$ and x > 0, find the value of $$\left(x^2 - \frac{1}{x^2}\right)$$.

A

$$12\sqrt{10}$$

B

$$18\sqrt{10}$$

C

$$24\sqrt{2}$$

D

$$24\sqrt{10}$$