$\left(2\sqrt{3}-\frac{1}{x}\right)^2$
$0.2^4$
$6,728\:-\:3,125\:+\:9,307\:$
$\frac{2x^3-6x^2-7}{x^2+1}$
$\frac{x}{5}+\frac{x}{2}+\frac{x}{4}<19$
$\left(12^4\right)^7$
$arctan\left(tan\left(\frac{56}{45}\pi\right)\right)$
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