$\tan\left(x\right)^2-4=\tan\left(x\right)$
$t+\frac{t^2}{2}+t^2+1$
$\left(u^{-2}\right)^{12}$
$\left(x^2\right)^0$
$16a^2-81b^4$
$\lim_{x\to0}\left(\frac{cos8x\:-\:1}{2x}\right)$
$\frac{25x-13x}{5x+25}$
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