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How to calculate this improper integral using residues [math] \displaystyle\int_{-\infty}^{+\infty} \frac{x^2+4}{x^4+16} \,dx [/math] - Quora
SOLVED: 5 . Without using a calculator find the least residue of 3100.000 modulo 35 6. Suppose that a is positive integer relatively prime to 10. Show that divides infinitely many repunits'