$\lim_{x\to+\infty}\left(\frac{x\left(5+sin6x\right)}{x+3}\right)$
$\frac{dy}{dx}=-y^4$
$\int_{\frac{4}{3}}^{12}\left(\frac{1}{\sqrt{x}\left(4+x\right)}\right)dx$
$-\frac{cos2x}{2}$
$3x-y+5z=12$
$logx-log\left(x+9\right)=1$
$x^2+9+20$
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