$\lim_{x\to-\infty}\left(\frac{x^7+5x+2}{x^6+4}\right)$
$\sqrt{3by^2}$
$x^6+125y^{12}$
$\frac{dy^2}{dx^2}-w^2x=0$
$\sin\left(2x\right)\frac{\sin\left(x\right)}{1-\cos\left(x\right)}$
$-2\cos\:^2x-5\sin\:x-1$
$\frac{x^{-4}y^6y^3}{x^{-7}}$
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