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  • Oct 29, 2013, 04:34 AM
    rhydex247
    Series
    please help me to sum the series cos@+cos2@+cos3@+...
  • Oct 29, 2013, 08:25 AM
    ebaines
    I assume you are familiar with Maclauren series expansion:



    Apply this to , then , etc. and sum them. What do you get?

    By the way, I would point out that this series does not converge, but rather with increasing values of 'n' cycles about 0 with an amplitude that depends on the value of x.

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