$\lim_{x\to-\infty}\left(3x+\sqrt{9x^2-2x}-1\right)$
$2x+3x^2-\left(2x+x^2\right)$
$y'+\:\left(1+\frac{2}{x}\right)y=0$
$2x^2-3x^2$
$3cos\:u\:sin7u$
$2xy'=y$
$\frac{dy}{dx}=\frac{x}{7\cos\left(y\right)}\:$
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