$\left(2x-1\right)^2=3\left(x+1\right)^2$

$b+7ab-4ab-b$

$\frac{dy}{dx}=\frac{-\left(e^y\:+\:kx\right)}{\left(xe^y\right)}$

$\left(a+c\right)^4$

$\frac{dy}{dx}=\frac{2y^5+5x^5}{xy^4}$

$\int e^x\cdot\cos\left(3x\right)dx$

$\left(0.3x^2\:y+0.2z^3\:\right)\left(0.3x^2\:y-0.2z^3\:\right)$