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zum27
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
a, [tex] \lim_{x\to 0} \frac{\sqrt{x+1}-1+tan5x}{x}[/tex]
b, [tex] \lim_{x\to 0} \frac{1 - cosx.cos2x.cos3x... cos11x}{x^2}[/tex]
b, [tex] \lim_{x\to 0} \frac{1 - cosx.cos2x.cos3x... cos11x}{x^2}[/tex]
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