$\frac{\left(cos^2x+1\right)}{cos^2x}$

$\left(4x-2y+5z\right)^2$

$a^{\left(2\right)}+2a\left(a-b\right)+\left(a-b\right)^{\left(2\right)}$

$\left(24a\:+\:10\right)\:\left(24a\:-\:10\right)$

$\frac{dx}{dt}=30-4x$

$\left(\frac{2}{5}xy+\frac{1}{4}z^2\right)\left(\frac{2}{5}xy-\frac{1}{4}z^2\right)$

$10x-4=2x-20$