$\lim_{x\to\infty}\left(\frac{\sqrt{x-2}-\sqrt{x}}{\sin\left(\frac{1}{\sqrt{x}}\right)}\right)$
$\left(2x+7\right)\left(5x+10\right)$
$4x^2y\cdot3x^5y^2$
$-\left(4-9\right)+1-8\left(5-9\right)$
$\frac { x ^ { 4 } - 3 x - 5 } { x - 2 }$
$\frac{x^2+5x+7}{x+3}$
$12x^6-6x^3$
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