$\frac{1}{x\cdot x+1}$
$\frac{dy}{dx}=\frac{x^2+1}{y^2}$
$\left(\frac{9x^5}{x^2}\right)^2$
$3.5\cdot271.16$
$-2\cdot\left(-3\right)-\left(1+4\right)$
$5+8.3+2$
$7x-7\le7\left(x-1\right)$
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