SOLUTION: Find the exact value by using a half-angle identity. cos(-pi/8)

SOLUTION: Find the exact value by using a half-angle identity. cos(-pi/8)

Algebra.Com

Question 769452: Find the exact value by using a half-angle identity.
cos(-pi/8)
Answer by tommyt3rd(5050) (Show Source): You can put this solution on YOUR website!
cosine is an even function so

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