differentiation

Question: The derivative of function $f(x)$ is ${\tan ^4}x$. If $f(0) = 0$ then $\mathop {\lim }\limits_{x \to 0} \frac{{f(x)}}{x}$is equal to



1) 1
2) 0
3) –1
4) None of these
Solution: Explanation: Explanation
standard-differentiation

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