$\lim_{x\to0}\left(\frac{x^2e^2}{cos\:x-1}\right)$
$448\cdot1^8$
$3f^2-72f+315=0$
$\frac{15^{10}\cdot15^3}{15^4}$
$\int\frac{\left(4x-1\right)}{\left(x^2+x-2\right)}dx$
$-0,25-3,6-4,2+8,6+1,05$
$\int8xe^{-x}dx$
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