$1750+4x\le4000$
$\sqrt{2x+1}=13$
$2x+10\ge4$
$8a^3-4ab-20a^2+10b^3$
$\frac{12x}{x^2-1}\cdot\frac{x+1}{3x}$
$\frac{cot^2t}{cos\:t}=cot\:t\:csc\:t$
$\int_0^r\frac{r}{\sqrt{r^2-x^2}}dx$
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