$49-y^2-8y+15$
$\frac{5x^2y^{-3}}{2x^4}$
$\lim_{x\to1}\left(\frac{7x+9}{x-1}\right)$
$\int\left(lny\right)dy$
$14\cdot6$
$a\left(a+1\right)+b\left(b+1\right)$
$-2x^2-7x+4$
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