$\int\sqrt{196-t^2}dt$
$\left(\frac{5}{6}a+\frac{3}{7}b\right)\left(\frac{5}{6}a-\frac{3}{7}b\right)$
$80+212$
$\frac{4x^2-9m^2n^4}{2x-x}$
$\lim_{x\to infinity}\left(x+e^{\frac{x}{8}}\right)^{\frac{8}{x}}$
$x-5\le3+2x$
$\left(20x+2\right)^2$
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