SOLUTION: How do I solve a question such as: Find the exact value. (a) cos(1/4)pi Thank you!

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Question 798445: How do I solve a question such as:
Find the exact value.
(a) cos(1/4)pi

Thank you!
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
To get an idea where thye angle is, I
convert to degrees.
+pi+ = 180 degrees
+pi%2F2+ = 90 degrees
+pi%2F4+ = 45 degrees
I know that the cosine of 45 degrees
is +1%2Fsqrt%282%29+