$h^2-12h+36$
$\frac{11\left(\infty\right)+6}{4-6\left(\infty\right)}$
$g\left(x\right)=\left(x^2+1\right)\left(2x-5\right)^{-2}$
$\left(52-\left[-30+40\right]-80\right)-\left(+30\right)$
$xsaxazcx$
$4d^2+20d+25$
$\lim_{x\to9}\ln\left(x^2-81\right)\:$
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