$2x+3<x+1$
$y\:+5y'+10y=510e^2tcos6t$
$60x^2+8x+2$
$\left(\tan x+\cot x\right)\sec^2x-\cot x$
$16x^2-8x-3$
$\ln e^{3x}=12$
$\lim_{x\to0}\left(\frac{x-ln\left(1+x\right)}{cos\left(\frac{x}{2}\right)-1}\right)$
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