$\frac{dx}{dt}=x+3$
$x-3>7$
$\lim_{x\to0}\left(\frac{3x-4^x}{x}\right)$
$\sqrt{004}$
$-4x+3x-5+6x$
$\frac{1+sen2x+cos2x}{1+sen2x-cos2x}=ctgx$
$\int\frac{x}{\left(x^2-2\right)^2}dx$
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