$\left(x^3+3x^2-7x+15\right)+\left(x^3+10x^2+22x-15\right)$
$\lim_{x\to\infty}\left(\frac{x+\sin\left(x\right)}{x-\sin\left(x\right)}\right)$
$\frac{dy}{dx}=\frac{-x^2-1}{y^4+1}$
$144-x^2y^2$
$3y^2+9y$
$\left(a^2-b\right)^2$
$\frac{x^3-19x-30}{x^3-3x^2-10}$
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