$-754+\left(+78\right)+\left(-274\right)+\left(-2563\right)-\left(-123\right)$

$\int\:\frac{5}{x^2+1}dx$

$\int\:\frac{24}{t^4-6t^3}dt$

$\frac{du}{dt}=\left(2+t\right)\left(1+u\right)$

$\int_{-\infty}^{-1}\left(\frac{5}{\sqrt{3-x}}\right)dx$

$\int x ^ { - 9 } d x$

$\frac{d}{dx}2xy=\sqrt[3]{1+x^2y^2}$