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Mathematics 20 Online
OpenStudy (anonymous):

cos(2)a+cos(2)(a+pi\n)+cos(2)(a+2pi\n)...+cos(2)(a+(n-1)pi\n) = ?

OpenStudy (anonymous):

cos(2)a+cos(2)(a+pi\n)+cos(2)(a+2pi\n)...+cos(2)(a+(n-1)pi\n) =

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