$\lim_{x\to1}\frac{x-1}{\ln\left(x\right)}$
$21xy+\left(-9xy\right)$
$\int_0^{\pi}\left(cos\left(x-xn\right)\right)dx$
$dp-\left(p-1\right)^2dt=0$
$3y^2-12y+12$
$7^2y+21y^3$
$11xy-x^2z+23x^2z$
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