$\left(x^{\frac{2}{3}}\right)^{-6}$

$\left(6m^4n^5+2\right)^2$

$+9-12+5-\left(+1\right)+3-12-8-6-4$

$\sqrt{y}=1-\sqrt{x}$

$\int\left(t^2\:+\:t\right)\left(\frac{1}{t}\right)dt$

$\int\frac{-4}{\left(x^2+4\right)\left(x^2+4\right)}dx$

$\left(x^2+1\right)\left(y-4\right)$