$\lim_{x\to1}\frac{x-2}{2-\sqrt{4x-x^2}}$
$\int\:\frac{x^2}{2x^3-6}dx$
$7x+5<-2\left(4x-3\right)$
$\int\left(7xln4x\right)dx$
$\lim_{x\to\infty}\left(\frac{2}{2^x-1}\right)$
$cot^2\left(x\right)=1-csc\left(x\right)$
$\int\frac{x}{\sqrt{4-9x^4}}d\left(2x\right)$
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