$\frac{d^2}{dx^2}\sqrt{9-x^2}$

$\int\left(\frac{64}{\left(x+2\right)\left(x-2\right)}\right)dx$

$x^2+8a^2+5x^2+5a^2$

$4x\:-\:2\:\left(3x\:+\:3\right)$

$\lim_{x\to100}\left(1+\frac{1}{x}\right)^x$

$\int_0^{2\pi}\frac{1}{1+2\left(senx\right)^2}dx$

$\sqrt{0.004464999999999999}$