$3^2+13x-2$
$y\:=\:\ln\left(x\right)+\ln\left(x\:-\:2\right)-\ln\left(x^2-4\right)$
$\frac{x^3-x+12}{x-4}$
$5x-3x+x-4+2x$
$\frac{1}{tan\left(5x\right)}$
$\left(4a-3\right)=\frac{a+13}{a+1}$
$x^2+11x+361$
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