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

$-\frac{7}{3}x+2$

$y^3=\sqrt{9x^2+4}$

$\frac{1}{\csc\left(x\right)}\left(\csc\left(x\right)_-\frac{1}{\csc\left(x\right)}\right)$

$\left(x^3-2\cdot y\right)^3$

$\frac{sin\left(x-y\right)}{cos\left(x\right)}$

$\int\left(e^{-3x}\cdot\left(4-e^{-3x}\right)^2\right)dx$