SOLUTION: Why does cos(85 degrees)+cos(95 degrees)= 0?

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Question 566833: Why does cos(85 degrees)+cos(95 degrees)= 0?
Answer by solver91311(24713) About Me  (Show Source):
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because

Look at the unit circle, recall that the cosine function is the coordinate, and note that 85 degrees is 5 degrees ahead of 90 and 95 degrees is 5 degrees past 90.



John

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