$\lim_{x\to\infty}\left(\frac{1}{x^4-2x^2-x+1}\right)$
$csc^2\left(2x\right)-2$
$25m^2+10m+4$
$3x+6y-6z=9$
$64m^{12}+125n^6$
$+4-22-18-8-25$
$\left(4+\sqrt{x}\right)^2$
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