How do you evaluate $cos (pi/6)$ ?

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How do you evaluate $cos (pi/6)$ ?

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Answer 1 · 2018-05-23T04:02:45

$(sqrt3)/2$

Explanation:

Since $pi/6$ is 30 degrees on the unit circle, draw a triangle on the where 30 degrees is the reference angle. Since cosine is $a/h$ , the respective sides are $sqrt3$ being the adjacent side and 2 being the hypotenuse.

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How do you evaluate $cos (pi/6)$ ?

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