$2^{-2}\cdot2^2$

$\left(42\right)\left(-31\right)\left(-73\right)\left(-19\right)\left(-38\right)\left(0\right)\left(-1\right)$

$\int_1^{\infty}\left(\frac{e^x}{x^2}\right)dx$

$\lim_{x\to0}\left(\frac{2x^2-3x}{x^2+x}\right)$

$2x+y-z=-6$

$\left(6y^2+2xy\right)dx-2x^2dy=0$

$70+4$