$\int_{-\infty}^{-3}\left(\frac{x}{x^2-4}\right)dx$

$\lim_{x\to3.9}\left(\frac{x^2-16}{x+4}\right)$

$\int^21\left(x^2+4x-2\right)dx$

$\frac{d^2}{dt^2}\left(t^{11}\ln\left(t\right)\right)$

$\lim_{x\to-5}\left(\frac{x^2+13x+40}{x+5}\right)$

$x^2y-2xy^2+8;\:x=3;\:y=-2$

$-3b+\left(-3a\right)+4a$