Derivative as a Limit
Let $$f$$ be the function defined by $$f(x) = \cos(2x)$$. What is the value of $$\displaystyle\lim_{x \to \frac{\pi}{4}} \frac{f(x) - f\left(\frac{\pi}{4}\right)}{x - \frac{\pi}{4}}$$?
A
$$-1$$
B
$$2$$
C
$$0$$
D
$$-2$$
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