$\left(x^2-y^2\right)^2-\left(y^2-z^2\right)^2$

$\frac{d}{ds}\left(ut+\frac{1}{2}at^2\right)$

$\frac{1-\cos\left(0\right)}{\sin\left(0\right)}$

$3x^2-39x+108=0$

$\lim_{x\to0}\left(\frac{4-x}{2-\sqrt{x}}\right)$

$\frac{d^2}{dx^2}\left(x^3\:+\:5xy^2\:+\:2y^3\right)$

$\left(a+3\right)^2\left(a+3\right)^2$