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1, \mathop {\lim }\limits_{x \to 0 } \frac{tanmx}{sinnx}
2, \mathop {\lim }\limits_{x \to x_{0}} \frac{tanx - tanx_{0}}{x - x_{0}}
3, \mathop {\lim }\limits_{x \to \frac{\pi}{4}} \frac{sinx - cosx}{\pi - 4x}
4, \mathop {\lim }\limits_{x \to \frac{\pi}{2}} \frac{cosx}{\pi - 2x}
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