$\left(9x^{3+2z}\right)\left(x^{3+4z}\right)$

$\cot\left(y\right)^2-\cos\left(y\right)^2=\cot\left(y\right)^2\cdot\:\cos\left(y\right)^2$

$-3^3\:+\:-2\left(-7\left(-3\right)\:-1\right)\:$

$\sqrt{7}\sqrt{7}$

$e=\frac{xy}{z^2}$

$x-6x+8>\frac{\left(10x-20\right)}{5}$

$3b+8+2b$