$\left(-9x^{-3}y^2\right)^{-4}$

$-\left(x+4\right)^2+12$

$\int\left(x^2\left(x^3+1\right)^{\frac{5}{2}}\right)dx$

$676-\left(-240\right)$

$\int\left(\frac{e^{6x}}{1+\left(e^{6x}+2\right)^2}\right)dt$

$-\left(3x-4\right)=3x+4$

$\frac{d^2}{dx^2}\left(x-y+2xy=2\right)$