$\left(-1900\right)-\left(-2000\right)$
$\lim_{x\to\infty}7x+4$
$\left(x-3\right)\:\left(x+5\right)>0$
$9x^2-6x\ge-1$
$\frac{dx}{dy}=-x=2y^2$
$\frac { 2 n - 2 n } { 2 n }$
$\int\frac{x}{cos^24x}dx$
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