$7x^2-12x+36$
$\sqrt{54x^3}$
$f=in\left(\frac{x}{x^2+1}\right)$
$\int\:\:\frac{x\:-\:arctg\left(5x\right)}{1+25x^2}dx$
$4x^2+32+162$
$x=\frac{y}{x}$
$35,4\cdot7=\:$
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