$\left(4x^{-3}\right)\left(12x^{-3}\right)$

$\sqrt{208}$

$\int_0^{\pi}9\cdot8^{\sin\left(x\right)}\cos\left(x\right)dx$

$2y+5y-8y$

$\left(5x-6z\right)^2$

$\lim_{x\to0}\left(\frac{\ln\left(\arctan\left(2x\right)\right)}{\frac{1}{\sin\left(2x\right)}}\right)$

$\frac{\left(2sen^2\left(o\right)-1\right)^2}{sen^2\left(o\right)-cos^2\left(o\right)}=1-2cos^2\left(o\right)$