$\int\:u\:sec\left[2\right]\:\left(u\right)\:du$

$\left(49^4-16\right)$

$\lim_{x\to\infty\:}\left(\frac{x^32^x}{x^23^x}\right)$

$\left|\left(1+x^2\right)-1\right|$

$\int\left(x^2+2\right)^9xdx$

$\int1\sqrt{x^2-1}dx$

$\frac{d}{dx}\left(\ln\left(\sin\left(x^2+3x\right)\right)-\frac{1}{2}\left(sin\left(x\right)\right)^3\right)$