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Sigma n=1 to infinity of cos n*pi/2
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Sigma n=1 to infinity of cos n*pi/2

User Bfitzpatrick
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H/o just to make sure I'm rite is it cos(npi/2) or cos(npi)/2? Sorry, I just want to make sure

> sum((1/2)*cos*n*Pi, n = 1 .. infinity); "(->)" infinity = 0
User Danchez
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