$\frac{d^2}{dx^2}\left(x\cdot\ln\left(x^2+e^y\right)\right)$

$\left(2x-1\right)\cdot dx-\left(3y+7\right)\cdot dy=0$

$\lim_{x\to-\infty}\left(4^{5+x}\right)$

$\lim_{x\to\infty}\left(xsin\left(6\pi\right)\right)$

$3x+1\:+\:3x+2$

$5 - 7 + ( 7 - 3 ) - ( 2 + 56 ) + 3$

$x^2-x+56$