$x\frac{dy}{dx}+3y=\frac{e^{3x}}{x}+6$
$\frac{senx}{cscx-cotgx}-cosx-1$
$\lim_{x\to-2}\left(\frac{x^2-x-6}{x^2+5x+6}\right)$
$+\left|30-30-5b\right|+7b$
$\int\frac{1}{\sqrt{4x^2+5}}\:dx$
$\left(x^2-\sqrt{2}x\right)$
$x-5\cdot x+5$
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