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Symmetrien


$\displaystyle \sin (-x)$ $\displaystyle =$ $\displaystyle - \sin x$  
$\displaystyle \cos (-x)$ $\displaystyle =$ $\displaystyle + \cos x$  
$\displaystyle \tan (-x)$ $\displaystyle =$ $\displaystyle - \tan x$  
$\displaystyle \cot (-x)$ $\displaystyle =$ $\displaystyle - \cot x$  
$\displaystyle \sec (-x)$ $\displaystyle =$ $\displaystyle + \sec x$  
$\displaystyle \csc (-x)$ $\displaystyle =$ $\displaystyle - \csc x$