$\frac{dy}{dx}\left(xy^2+2x=4\right)$
$2x+y+3z=0$
$0,05+2,8-4,5$
$\frac{\sqrt[1]{x^2+3}-2}{x-1}$
$cosec^4\:a\:-\:cosec^2\:a\:=\:cot^4\:a\:+\:cot^2\:a$
$32\cdot2$
$x^2+6x-55$
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