$5\:-\:\left(4\:-\:7\right)\:+\:\left(-3\right)\:-\:\left(5\:+\:4\right)$

$\left(6-8y\right)\left(8y-6\right)$

$9r^3+24rs+16^2$

$\frac{11}{2}cos^2\left(x\right)$

$36b^2-9$

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

$\lim_{x\to\infty}\left(\frac{1}{32}\right)e^{-x^{32}}$