$\frac{x^2+x^{-2}}{x^3+x^{-3}}$

$2\:-\:\left(-3\right)\:\cdot\:5\:+\:4\:\cdot\left(-7\right)$

$\left(\frac{m^3}{m^{-7}}\right)\left(\frac{1}{16}\right)$

$\left(5x+1\right)^2-2\left(3x+2\right)=7x\left(x-3\right)$

$-2\left(-8\right)^2+4$

$3b-x+2b$

$\lim_{x\to\frac{\pi}{2}}\left(\frac{\ln\left(\sin^2\left(x\right)\right)}{\left(\frac{\pi}{2}-x\right)^2}\right)$