SOLUTION: Simplify the expression by using a double-angle formula. cos^2(2pie/5) - sin^2(2pie/5)

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Question 1036269: Simplify the expression by using a double-angle formula.
cos^2(2pie/5) - sin^2(2pie/5)
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
No math problems with pie, unless it's a pie chart.
Use the Greek letter pi.