$\lim_{x\to0}\left(\left(cosh\left(t\right)\right)^{\frac{1}{t^2}}\right)$
$\frac{x-3}{x}\le2$
$\int_{\frac{1}{2}}^3\frac{3}{\sqrt{5x^2-5}}dx$
$20-9x+4y+7-x$
$r^2-12r+27$
$-16\cdot23$
$\frac{x-4}{3x+9}$
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