$\frac{d}{dx}x^2-xy=y^2$
$n\:log\:n$
$m^2=81$
$\left(a-b\right)\left(a^3+b^3\right)$
$0,15+1,355-0,5$
$5x<400$
$\frac{4}{35}a^2b-\frac{12}{5}ab+\frac{8}{15}a^2b^3-\frac{16}{25}a^3b$
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