$b^2+7b+12$

$\frac{\left(\frac{-4}{3}\right)-\left(\frac{3}{4}\right)}{1+\left(\frac{-4}{3}\right)\left(\frac{3}{4}\right)}$

$3^{-2}\cdot3^1$

$2y\cdot\frac{dx}{dy}=x\left(x^2-16\right)^{-\frac{1}{2}}$

$\left(4x+4x^6\right)$

$2\int_0^{\infty}\left(\frac{\sin\left(x\right)}{x}\right)dx$

$x^4y^3dx\:=\:y^2dy$