$4x-3x^2\:-\:16x$
$\int\frac{x}{x^2-14x+49}dx$
$45+12x-x^2$
$\frac{b}{-4}+4=-14$
$cotx=\frac{1}{2}$
$\sqrt{\left(-4\right)^2}+7^2$
$\left(2x+1\right)^3-\left(8x+3\right)^2$
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