$\lim_{a\to0}\frac{-b\sqrt{b^2-4ac}}{2a}$
$\left(2^{-2}\right)^{-2}$
$cos^2\left(2x\right)-cos\left(2x\right)=0$
$\frac{d^n}{dx^n}\left(\cos\left(x\right)\right)$
$\left(7x^2y^{10}\right)^3$
$4x^6+6x^2$
$\left(50-100\right)+50\:30$
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