$\frac{x-3}{6x-18}+\frac{3-x}{x^2+x-12}$
$\left(2y^{-1}\right)^3\cdot xy$
$-33+18+\left(29-45-4\right)-\left(30-58\right)$
$x ^ { 4 } - 2 x ^ { 3 } - 5 x ^ { 2 } + 6 x$
$\frac{2x^3+10x^2+16x+8}{4x^3+8x^2-4x-8}$
$\lim_{x\to2}\left(\frac{2x-3}{x^2-4}\right)$
$4sen2\left(x\right)=1$
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