SOLUTION: Use an identity to find the exact value of the expression:
Note: You are not allowed to use decimals in your answer.
cos(202.5)
Algebra.Com
Question 952158: Use an identity to find the exact value of the expression:
Note: You are not allowed to use decimals in your answer.
cos(202.5)
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
cos(202.5) = cos(405/2)
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The half-angle formula for cosine is tedious. Cos^2 is much simpler.
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cos^2(405/2) = (1 + cos(405))/2
=
(negative in Q3)
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