$\lim_{x\to infinity}\left(\frac{1}{x}-\frac{1}{e^x-1}\right)$
$x+75\geq90$
$\left(x-y\right)\cdot x=y+x$
$\int\frac{x\left(x^2+4\right)}{x^2-4}dx$
$\sqrt{x}^2-2$
$\frac{4}{\ln\left(9\right)}\cdot3^{e^{\sqrt{x}}}+c$
$\sin\left(4x\right)=-\frac{\sqrt{2}}{2}$
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