$\lim_{x\to1}\left(\frac{x^2-x+1}{x^2-1}\right)$
$\left(4x+3\right)-\left(-8x-1\right)$
$3\sqrt{x^7}-\sqrt{x}+2\sqrt[5]{x^2}$
$\frac{7}{8}m+2m$
$\left(2mn+6\right)\left(2mn+22\right)$
$\int_x^4\sqrt{x^2+3}dx$
$y=x^2+10x+25$
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