$4xb-6x^2a+6yb-9xya$
$\lim_{x\to3}\frac{x-3}{x^2-x-5}$
$\frac{64x}{\left(4^2+5\right)^3}$
$\lim_{y\to x^2-x}\left(\frac{yx}{x+y}\right)$
$\int\sqrt{x-10}dx$
$\int\csc\left(x\right)\left(\csc\left(x\right)-\cot\left(x\right)\right)dx$
$\frac{6x^3+6x^2-3x}{3x}$
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