Question
Evaluate the following limit:
$\lim\limits_{\text{x}\rightarrow{\frac{\pi}{2}}}\frac{\sin2\text{x}}{\cos\text{x}}$

Answer

$\lim\limits_{\text{x}\rightarrow{\frac{\pi}{2}}}\frac{\sin2\text{x}}{\cos\text{x}}$

 

$=\lim\limits_{\text{x}\rightarrow\frac{\pi}{2}}\frac{2\sin\text{x}\cos\text{x}}{\cos\text{x}}$

$=2\lim\limits_{\text{x}\rightarrow\frac{\pi}{2}}\sin\text{x}$

$=2\times\sin\frac{\pi}{2}$

$=2\times1$

$=2$

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