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2 cos ""(pi)/(13) cos ""(9pi)/(13) + cos...

`2 cos ""(pi)/(13) cos ""(9pi)/(13) + cos ""(3pi)/(13) + cos "" (5pi)/(13) = 0.`

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2cos(pi/13)cos(9pi/13)+cos(3pi/13)+cos(5pi/13)=0