$\sin\left(x+\pi\right)$
$xt\frac{dy}{dx}\:-\:t^2x^2\:=\:7t^3x^2\:-\:18t^4x^2\:+\:7x$
$\lim_{x\to-3}\left(4x-7\right)$
$16\left(5x-9\right)^2$
$\left(yx^3\right)^4$
$4+7-\left|-3+6-\left(4+8\right)+2\right|$
$x^2+18x-4$
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