$\left(x-2\right)\left(y+2\right)$

$\sqrt{7}\tan\left(2x\right)+\sqrt{7}\sec\left(2x\right)$

$x\frac{7}{2}\left(x^2\right)$

$\frac{6x^2+13x-5}{6x^2+17x+5}$

$\left(6a+8m\right)\left(6a-8m\right)$

$y=\left(4-2x\right)^{2}\left(5+4x^{3}\right)^{4}$

$\lim_{x\to\infty}\left(\frac{\sqrt{x^5+1}}{x^2+1}\right)$