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Unit Circle, important angles

December 5, 2016 Mouctar Trigonometry 0

Angles greater than 180 degrees, continued

Looking at the following figure, we can see that $\triangle AEB' \cong \triangle AEB'$ by the SAS postulate.

We can see that $2\pi-\alpha$ is also called $-\alpha$

The functions:

$\sin (-\alpha)=-\sin \alpha$

$\cos (-\alpha)=\cos \alpha$

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