2pi = 360 degrees
pi = 360/2 = 180 degrees
thus, Cos pi/6 = Cos 180/6
= Cos 30
Considering special angles,
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![\text{Cos 30 = }\frac{\sqrt[]{3}}{2}](https://img.qammunity.org/2023/formulas/mathematics/college/zlj55d64m39qz8d3r20iyrfe08c6iwughv.png)