$\lim\:_{x\to\:0}\left(\frac{x^2+x}{\:x-1}\right)$

$\left(-2n^4\right)\left(2n^{-1}\right)$

$\frac{3csc\left(x\right)cos\left(x\right)+3sec\left(x\right)sin\left(x\right)}{4csc\left(x\right)}$

$xy^3dx+e^{x^2}dy$

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

$\lim_{x\to0}\left(x^2ln\left(x\right)\right)$

$\frac{x^3-x^2+11x^1-1}{x^1+1}$