$\lim_{x\to2}-\left(\frac{x+1}{2-x}\right)$
$5 ( 2 ) ( \sqrt { 3 } ) ^ { 4 }$
$x^2-2x+\frac{3}{x}-1$
$\frac{d}{dx}x^3y^2+\sqrt{x+4y}$
$\frac{2x+10}{x+3}\ge1$
$2x^2-22x+48=0$
$\int\left(z-\sqrt{2}z^2\right)^2dz$
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