$\left(1+2+\sqrt{1^2+2^2}\right)\left(1+2-\sqrt{1^2+2^2}\right)$
$2.\left(3x^4-5x^2\right).x-6x.x^3.x+9x^4:3x$
$y'=\frac{5}{x}$
$9x^2-12x+5$
$7-\left[44-\left(2+5\right)\:\right]$
$\frac{dy}{dx}=-\frac{y}{x}+3x^{-2}$
$\frac{3x^2-5x+1}{x+1}$
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