$h2-121$
$\frac{2cos\left(3x\right)+1}{cos}$
$x^2-2x<63$
$\left(4x-x^2\right)^x$
$\int\frac{cost}{1+sint}dt$
$\lim_{t\to0}\left(\frac{\sqrt{x+t}-\sqrt{x}}{t}\right)$
$\left(6-3b\right)^2$
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