$xdy+\left(x^2y-y\right)dx$
$\lim_{x\to2}\left(\frac{3x^2+ax+a+3}{x^2+x-2}\right)$
$0,5cm^3+15cm^3$
$5x-\:4y\:-3y$
$4.7t+13=-5.33$
$\int\frac{2}{\left(\sqrt{5+4x-x^2}\right)}dx$
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