$\int\frac{-2x-4}{x^3+x^2+x}\:dx$

$\lim_{x\to0}\left(x\:ln\left(cos\:x\right)\right)$

$7x-8y;\:x=5;\:y=2$

$\frac{d^4y}{dx^4}\left(x^3-x^2+x-1\right)$

$\int\left(3x^5-2\right)^{-5}\left(15x^4\right)dx$

$-693+42$

$\lim_{x\to-\infty}\left(x\left(x-\sqrt{x^2+1}\right)\right)$