Question

\[\lim_{x \rightarrow 0} \frac{1 - \cos 2x}{x^2}\]
So I get, after multiplying by comjugate:
\[\frac{1 - (\cos 2x)^2}{x^2(1 + \cos 2x)}\]
What now? Am I supposed to recognize some form of sinx/x or something?

Answer 1

I didn't recognize the trig identity in the numerator because the 2x threw me off. Got it now