$m^2+39m$
$\frac{x}{\sqrt{x}-1}$
$2sinxcosy\:=\:sin\left(x+y\right)\:+\:sin\left(x-y\right)$
$x^2+9x+13$
$-12+\left(-2\right)\left(-4\right)$
$x+4x+12=17$
$\frac{5a+1}{5a}-\frac{1}{a}=1$
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