$\left\{x-y\right\}\left\{x-y\right\}\left\{x\right\}$

$\left(2a+1\right)\left(1+2b\right)$

$\cos\left(2x\right)+\cos\left(x\right)=1$

$\lim_{x\to1}\left(\frac{x^2-1}{x\:-1}\right)$

$\int_0^b\left(\frac{1}{8-x^3}\right)dx$

$42\times\left(\frac{3x-3}{6}\right)$

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