$\left(x-4\right)\left(x^2-8x+16\right)$

$\left(3x^2-4\right)^4$

$\int\sec^2\left(4-6x\right)dx$

$16\left(2-x\right)=64$

$\lim_{x\to\infty}\left(\frac{\sec\left(x\right)}{1+\tan\left(x\right)}\right)$

$\left(z+30\right)\left(z-20\right)$

$\cos\left(x+y\right)+\sin\left(x-y\right)$