$x^4+2x^3-9x^2-2x+8$
$\int\left(\frac{2x^3-x^2-7x}{x}\right)dx$
$\frac{m^6-64n^6}{m-2n}$
$x^3+y^3=36$
$\frac{\left(1-tan^2x\right)}{sec^2x}$
$5b-1-3b$
$\frac{1}{3}bc-4bc$
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