$20\left(-1.5y+0.75\right)$

$2x+\frac{x+\frac{1}{2}x}{\frac{3}{2}x}$

$\left(\sqrt[2]{\frac{a}{2}}+\sqrt[2]{2a}\right)\left(\sqrt[2]{\frac{a}{2}}+\sqrt[2]{2a}\right)$

$\int\frac{x^3-4x}{x^4-8x^2+9}dx$

$\frac{dy}{dx}=\left(y^2+1\right)\sin\left(x\right)$

$x^2-x=12$

$2\sec\left(x\right)-8$