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Math Help - Finding series for sec(x) using sec(x)cos(x) = 1

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    s3a
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    Finding series for sec(x) using sec(x)cos(x) = 1

    The question (with solution) and my work are both uploaded (Question #11).

    I know I can find the b_n values using the summation for cos(x) and I know I must find the a_n values by solving for the Cauchy products for each successive c_n value but I do not know how to obtain the c_n values so that I can find the a_n values.

    Any help in solving this problem would be greatly appreciated!
    Thanks in advance
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    Last edited by CaptainBlack; October 6th 2011 at 05:53 AM.
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