SOLUTION: Find the exact value of the trigonometric function. cos -23π /6

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Question 643562: Find the exact value of the trigonometric function.
cos -23π /6

Found 2 solutions by solver91311, lwsshak3:
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!




would be two full trips around the unit circle backwards, so



is short of 2 trips around backwards and therefore is equivalent to forwards.

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Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
Find the exact value of the trigonometric function.
cos -23π /6
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Visually, this means you are rotating clockwise π/6 short of 2 revolutions (24π/6) which places the reference angle of π/6 in quadrant I where cos>0
cos -23π /6=√3/2