SOLUTION: please help thank you. use a double angle identity to find the exact value 2 cos^2(pi/8)-1

SOLUTION: please help thank you. use a double angle identity to find the exact value 2 cos^2(pi/8)-1

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Question 1085867: please help thank you. use a double angle identity to find the exact value 2 cos^2(pi/8)-1
Answer by ikleyn(52778) (Show Source): You can put this solution on YOUR website!
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= = .

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