$\left(5c+\frac{2}{3}\right)\left(5c-\frac{2}{3}\right)$
$18y^{2}+15y-18$
$\left(4x^ay^b\right)\left(9x^2y^3\right)$
$3x^2\left(x-2x^2+3\right)$
$\lim_{x\to1}\left(\frac{2x\:+\:3}{x^2\:-1}\right)$
$15x^2-23x+4$
$\int\frac{x}{x^2-11x+28}dx$
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