$\left(x^a+y^b\right)\left(x^a-y^b\right)$
$\lim_{x\to-1}\left(\frac{2x-2}{\sqrt{x}-1}\right)$
$4x+7+6x^3-1+3$
$\lim_{x\to0}\left(\frac{1-\cos\left(bx\right)}{tx}\right)$
$x+\frac{1}{x+2}$
$\frac{3x}{3x^2-3}$
$-5\cdot10-12$
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