hi

i have little problem here with this problem

i have to find a formula for this sum serie

1+cos(x)+cos(2x)+cos(3x)+....+cos(nx)

the hint is i have to use sum of geometric series with the general term e^(ikX)

thanks

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- November 14th 2009, 12:41 PM #1

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- November 14th 2009, 03:23 PM #2

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