$\lim_{x\to\frac{2}{\pi}}\left(x-\frac{\pi}{2}\right)secx$

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

$3y+6+y^2$

$32t\:+\:16\:and\:16\left(2\:-\:t\right)$

$\frac{1}{3}\cdot\frac{21}{2}\cdot\frac{6}{7}$

$x-23=-7$

$2\frac{1}{2}\left(0\right)-4\left(4\right)^2+6\left(3^2+3^2\right)$