$y'=cosx-sinx$
$0,25^{-\infty}$
$4x-4<40$
$4k^2+4k=5$
$\left(+6\right)\:-\:\left(-9\right)$
$\frac{x}{\left(\sqrt{25x^4+9}\right)}$
$\lim_{x\to\infty}\left(\frac{x^7}{24e^x}\right)$
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