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    How to Prove This Fourier Series Summation Equation?

    Fourier series summation...help! Basically, i need to show that... 2 + sum (m=1 to n) [4(-1)^m . cos(m.pi.x)] = 2(-1)^n.cos((n+1/2)pi.x)/cos((pi.x)/2) Any ideas?
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