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For:

$$f(x)=\frac { 2x }{ \tan { x } }$$

...find:

$$f'\left( \frac {\pi }{ 4 } \right)$$

A

$\frac { \sqrt { 2 } }{ 2 }$

B

$2+\pi$

C

$2$

D

$2-\pi$

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