$0\ge x-7$
$sin2x-cotx$
$2^3+8^2-5^2$
$\frac{d}{dx}\left(sin^2t\right)$
$\frac{d}{dx}e^{x-y}-x=cos^{-1}\:$
$\lim_{x\to-\infty}\left(x^2-1\right)$
$\frac{1}{\sqrt{x}-\sqrt{y}}+\frac{1}{\sqrt{x}+\sqrt{y}}$
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