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Oct
27
asked
Show that $\int_{-\infty}^\infty\frac{\cos(x)}{e^x+e^{-x}}dx=\frac{\pi}{e^{\pi/2}+e^{-\pi/2}}$?
Oct
27
asked
How to relate $2\sin(3\pi/8)-2\sin(7\pi/8)$ and $\csc(3\pi/8)$?
Oct
22
asked
$f$ has a zero at $z_o$ and $g$ has a pole at $z_o$. Prove that $fg$ has a removable singularity at $z_o$?
Oct
15
asked
Power series expansion of $\frac{z^2}{1-z}$?
Oct
9
asked
Cauchy's formula: $\int_\gamma \frac{e^{z}}{z(z-3)} dz $
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