$\left(x+9\right)\left(x-2\right)=0$

$\left(2x-3\right)^2-\left(2x+3\right)^2+\left(3x+4\right)^2-8x^2-16$

$\int x\sec^2\left(9x^2+\frac{1}{7}\right)dx$

$\left(1-a^3\right)^2$

$\int\left(x^2e^xcosx\right)dx$

$\left(\csc^2-1\right)\sin^2x$

$\frac{dy}{dx}=\frac{3e^{2x}}{y^3}$