$\int\frac{9x-45}{x^2-81}dx$
$x^2+2x+50$
$\left(a-b^2\right)+\left(b-c\right)^2-\left(a-c\right)^2$
$2an^4-16an^2+32a$
$y^2-2y-15$
$\left(-4y^{-3}\right)^4$
$x2-x-12=0$
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