$a^2-8a+15$
$\lim_{x\to-9}\left(\frac{2\sqrt{x-6}}{x-9}\right)$
$\int_1^5xe^{x^2}dx$
$4y+8y+12y^2$
$\int\frac{x^2+3x-7}{\left(2x-3\right)\left(x+1\right)^2}dx$
$x^2=02$
$\left(x-13\right)\left(x-20\right)$
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