$\sqrt{\left(x+8\right)^2-\left(x+9\right)\left(x+7\right)}$

$\int\left(\frac{3\sqrt{9-x^2}}{x}\right)dx$

$4m^2-4m=1$

$y=a\arccos\left(1-\frac{x}{a}\right)\sqrt{2ax-x^2}$

$-5-\left(-8\right)$

$\left(5b+3\right)\left(7b-3\right)$

$\lim_{n\to\infty}\left(\sqrt{n^4+2n^3}-\left(n^2+n\right)\right)$