$-40-\left(-16\right)$

$-14\:-\:\left(-16\right)$

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

$\lim\:_{x\to\:+\infty\:}\left(\frac{3x^2+2x-3}{x^4+5x^3+4x}\right)$

$\frac{3}{x-5}\ge\frac{1}{x-1}$

$-8x+19-3x$

$\lim_{x\to\infty}\left(\frac{1+x+x^6}{\left(1+x+x^2\right)^3}\right)$