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Q19Section II (Mathematics)19 of 190

Extracting a residue from the Laurent series of cos⁡(1/z)\cos(1/z)

The value of the integral 12πi∫∣z∣=1z3cos⁡(1/z) dz\dfrac1{2\pi i}\displaystyle\int_{|z|=1}z^3\cos(1/z)\,dz is:

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