$-441n^{10}+1$

$\left(6p^5+9q^4\right)\:\left(6p^5-9q^4\right)$

$\frac{x-b}{2x+6}$

$\left(3a\right)^5\times\left(3a^2\right)^2$

$\frac{1}{x-3}=\frac{x+1}{x-3}$

$\lim_{x\to-3}\left(\frac{x+3}{\sqrt{x+3}-4}\right)$

$\int\left(\frac{7\sqrt{x^3}}{\left(5+4\sqrt{x^5}\right)^2}\right)dx$