$\lim_{y\to0}\frac{x^3y+3xy^2+y^3}{2xy+5y^2}$
$x^2+18x-3$
$\left(-7-\left(-10\right)\right)\cdot8$
$2x-1\le2x+4$
$4m^2+8m-12$
$\tan\left(x\right)-\cot\left(-x\right)=\sec\left(x\right)\csc\left(x\right)$
$3-75x^2$
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