$\lim\:_{x\to\:\frac{\pi}{2}\:}\left(8\cos\left(5x\right)sec\left(-3\right)\right)$
$\frac{x}{4-x}<3$
$x^2+7x+5<0$
$7,93\cdot3,5$
$2x+3y=12\:\:$
$\frac{dy}{dx}=\left(2x-\left(x^2\right)\right)$
$\int\frac{10x^3-20x^2+8}{x^2-2x}dx$
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