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

$\int\left(4x+5\right)^3\:dx$

$\left(2y+y^2+1\right)\left(y-4\right)$

$x^2.-3x^2.-5x^2$

$\frac{d}{dx}7\left(5x+7\right)^{-1}$

$\left(-8\right)\left(+2\right)\left(-1\right)\left(+4\right)\left(-3+3\right)$