$6\sqrt{2}5\sqrt{9}$

$\frac{1}{4}y^2+4yz-3z+\frac{2}{3}y^2-\frac{1}{8}yz$

$\left(\frac{-x}{9}+1\right)^{0.5}$

$\frac{1+\cot\left(x\right)}{1+\tan\left(x\right)}=\frac{1}{\tan\left(x\right)}$

$ba\cdot6b-5a-2$

$\left(x+6\right)^2-\left(x-2\right)\left(x+6\right)$

$3x^2+10x^2+11x^2$