$121g^2-169y^4$
$20-\frac{5000}{x^2}$
$a^2+4ua+4ua+\left(4ua\right)^2$
$\left(\frac{x}{4}+1\right)^3$
$3,2\cdot7,5$
$\frac{d}{dx}\arctan\left(bx\right)$
$2x^3-12x^2=10x-60$
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