\(\rm \displaystyle \lim_{\theta\rightarrow 0}\frac{1-\cos m \theta}{1-\cos n\theta}=?\)

1
\(\rm \frac{m}{n}\)
2
\(\rm \frac{m^2}{n}\)
3
\(\rm \frac{m}{n^2}\)
4
\(\rm \frac{m^2}{n^2}\)

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