$e^y\frac{dy}{dx}=2x$
$\frac{dy}{dx}=\frac{\ln x+6x}{x^{2}}$
$cosh2x=2cosh^2x-1$
$2a+6+1$
$\frac{8+x^2}{2+x}$
$4x-3<8$
$3x-2x+5y+9y$
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