Prove that this is true for every n. (n is an element of natural numbers) cos(n*pi) = (-1)^n I would very much appreciate your help, thank you.
Last edited by jakobjakob; October 29th 2012 at 11:25 AM.
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Last edited by johnsomeone; October 29th 2012 at 11:33 AM.
Thank you for your help.
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