$\lim_{x\to1}\left(\frac{x^2+x}{x^2-1}\right)$
$3x^{-2x}$
$\left(9x-4y\right)\left(4y+9x\right)$
$-23-\left(19+2\right)$
$\frac{a^2+b^2}{b}-a$
$\left(m^2n^{-1}-2a^3b\right)^3$
$x^2-xy+y^5-0$
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