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Thread: I don't get it

  1. #1
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    I don't get it

    I don't know how to find out the taylor series of exp(x)*cos(x)
    I think I should write the taylor series for exp(x) and cos(x) separately and the multiply them, but I don't know how to multiply these two sums
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  2. #2
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    Re: I don't get it

    Quote Originally Posted by andrei1293 View Post
    I don't know how to find out the taylor series of exp(x)*cos(x)
    Assuming the series at $x=0$ we get $\sum\limits_{n = o}^\infty {\frac{{{f^{(n)}}(0)}}{{n!}}x^n}$

    I don't get it-u13.gif
    Last edited by Plato; Jun 11th 2017 at 10:06 AM.
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  3. #3
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    Re: I don't get it

    thanks for your help
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