$6t^2+36=0$

$\left(\frac{x^2}{3}-9y\right)^2$

$ln\left(2^x\right)$

$\left(7x^3y^3z^2-9\right)\left(7x^3y^5z^2+9\right)$

$sen^{-1}\left(\frac{1}{3}\right)+\:tan^{-1}\left(x\right)=\:\frac{\pi}{2}$

$23\:-\:\left(-35\right)$

$\lim_{x\to0}\left(\frac{x+2}{x+1}\right)^x$