APFIVE Derivative as a Limit
If $$f(x) = \cos(2x)$$, what is $$\displaystyle\lim_{x \to \frac{\pi}{4}} \frac{f(x) - f\left(\frac{\pi}{4}\right)}{x - \frac{\pi}{4}}$$?
A
$$2$$
B
$$0$$
C
$$-2$$
D
$$-1$$
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