$-3,8-19,7$
$y\cdot\tan x\frac{dy}{dx}=\left(y^2+4\right)\cdot\sec^2x$
$x^3-8x^2+16x-5$
$-7x+3\ge-18$
$\lim_{x\to\infty}\left(\frac{\log\left(x^2-1\right)}{x}\right)$
$\:y=x^4\left(x^3+4x\right)^{-2}$
$a3-5a-4a$
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