JEE Math Practice Question
$$\mathop {\lim }\limits_{x \to 0} {{{{\sin }^2}\left( {\pi {{\cos }^4}x} \right)} \over {{x^4}}}$$ is equal to :
- A.$${\pi ^2}$$
- B.$$2{\pi ^2}$$
- C.$$4{\pi ^2}$$
- D.$$4\pi $$
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