giving you:
.
(half the circumference of the unit circle is equivalent to 180 degree rotation).
is going to output an angle measurement in ![[0,\pi]](/tpl/images/0121/4543/2a07b.png)
.
.
implies 
since ![\frac{3\pi}{4} \in [0,\pi]](/tpl/images/0121/4543/8e3df.png)
.
Calculating cos-1 ( is gladly appreciated : ) )
...
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