$\frac{\sin^{2}x+1-\cos^{2}x}{\cos^{2}x}$

$\frac{dy}{dx}=\frac{2x-3y}{2x-3y+1}$

$\left(a^{x+2}-3\right).\left(a^{x+2}+3\right)$

$\frac{\left(2x\right)^0\left(2x\right)^{\frac{4}{5}}}{2x}$

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

$3x^2-15x+18=0$

$\int\frac{\left(1+z^2\right)^2}{z^2}\cdot dz$