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On the unit circle, at 30 degrees the point is ( sqrt(3)/2 , 1/2 )

Cosine "represents" the x value (x, y)

Therefore:

cos(30) = sqrt(3) / 2

It is highly advisable for you to memorize the unit circle -- at least the quadrant I angles (0, 30, 45, 60, and 90). I'll include a link to a good unit circle reference in the related links.

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Q: What is cosine of 30 degree angle?
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