$\frac{1}{12}x^2+\frac{7}{12}x^2+\frac{7}{12}x^2-\frac{3}{12}x^2$

$\sqrt[5]{-64x^7y^{10}z^{13}}$

$\left(6x+\:8y\right)\left(13x+3y\right)$

$\lim_{x\to0}\left(\frac{1-\sin\left(x\right)-e^x}{\ln\left(x+1\right)}\right)$

$\left(2x-1\right)^2-\left(2x+1\right)^2$

$80\:\frac{1}{2}\:-\:40\:\frac{1}{4}$

$\tan^2+3=0$