$5-b^3$

$4x+2nx+nx$

$\frac{dy}{dx}=9+5x+2x^2$

$\int\frac{8x}{\left(x-6\right)^2\left(x-4\right)}dx$

$\lim_{x\to+\infty}\left(\left(\frac{2^x+4^x}{3}\right)^{\frac{1}{x}}\right)$

$\lim_{x\to0}\left(\frac{x\tan\left(6x\right)}{\sin^2\left(8x\right)}\right)$

$\frac{x^5+2x^2}{x-1}$