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Really hard integrals?

  1. Mar 9, 2017 #181
    $$\int_{0}^{\pi}\frac{cos(nx)-cos(na)}{cos(x)-cos(a)} dx$$


    $$\int_{0}^{\infty }\frac{x}{e^{x}-1} dx$$
    Last edited: Mar 9, 2017
  2. Oct 13, 2017 #182
    Try this. 1507919193165-1998323113.jpg
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