$\left(\frac{x}{2}+\frac{y}{3}\right)^4$
$2m+3-m+4$
$\frac{x}{\left(1+6x\right)^2}$
$cos2x-21cosx=-14$
$\lim_{x\to1}37\left(1+\frac{0.47}{x}\right)^x$
$\frac{d}{dx}\sqrt{x^4+y^4}=2xy$
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