$\left(2^1\right)x\left(2^m\right)$

$\int\left(-7x+2\right)^7dx$

$\lim\:_{r\to\:\frac{1}{3}}\left(x^2+\frac{1}{9}\right)\left(x-\frac{1}{3}\right)$

$\sqrt{1+x^2},x=0$

$\lim_{x\to0}\left(\frac{1-\frac{1}{x}}{1-\frac{1}{x^2}}\right)$

$-3sgn\left(e\right)+2u\left(0.1\right)-\left[\left[-e\right]\right]$

$\left(r^5t^2\right)^3$