$\lim_{x\to\infty}\left(xln\left(1+\frac{2}{x}\right)\right)$

$\left(x+5\right)\left(x-5\right)$

$\int x\arctan\left(x-1\right)dx$

$15x^2y+8xy^2+36xy+12xy^2-8xy-9x$

$-8+11\left(x-0\right)-7\left(x-0\right)\left(x-1\right)+1\left(x-0\right)\left(x-1\right)\left(x-2\right)$

$\left(-2x^3yz^4\right)\left(-x^3y^2z^3\right)^4$

$\frac{dy}{dx}=e^{-y}cosx$