JEE Math Practice Question

The value of $$\mathop {\lim }\limits_{x \to {0^ + }} {{{{\cos }^{ - 1}}(x - {{[x]}^2}).{{\sin }^{ - 1}}(x - {{[x]}^2})} \over {x - {x^3}}}$$, where [ x ] denotes the greatest integer $$ \le $$ x is :

1. A.$$\pi$$
2. B.$${\pi \over 4}$$
3. C.$${\pi \over 2}$$
4. D.0