$\int\left(120x^3\left(15x^4+3\right)^{-3}\right)dx$

$\frac{dy}{dx}\:y=\:\frac{x-1}{\sqrt{x+1}}$

$\int^5-2\left(x+4\right)dx$

$\sqrt{1.11}-2$

$\lim_{x\to-\infty}\left(-2x^3+9x^2+7x-6\right)$

$\frac{\left(5x^2-\frac{13}{18}xy-\frac{2}{3}y^2\right)}{\left(3x-\frac{4}{3}y\right)}$

$-2^2-4$