$\frac{x}{ax^2}$
$\lim_{x\to3}3^{x-1}$
$3xy+2x-4y=1$
$\int\frac{x-2}{\left(x+1\right)\left(x-1\right)}dx$
$k-3=\frac{3+k}{k-3}$
$2x^2+4x-16$
$\int\cos\left(x\right)\cdot\:2^x\:dx$
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