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Phasenverschiebungen


$\displaystyle \sin \left(x + \frac{\pi}{2}\right)$ $\displaystyle =$ $\displaystyle \cos x$  
$\displaystyle \cos \left(x + \frac{\pi}{2}\right)$ $\displaystyle =$ $\displaystyle - \sin x$  
$\displaystyle \tan \left(x + \frac{\pi}{2}\right)$ $\displaystyle =$ $\displaystyle - \cot x$  
$\displaystyle \cot \left(x + \frac{\pi}{2}\right)$ $\displaystyle =$ $\displaystyle - \tan x$