$\left(3a-5\right)^2\left(3a+5\right)^2$

$x+\arctan\left(\frac{1}{tan\left(x\right)}\right)$

$\lim_{x\to0}\frac{6^{-2x}-1}{7x}$

$\frac{\left(4h^5\right)^2}{20h^8}$

$25x^3+30x^2-x$

$\frac{d}{dx}\left(\left(x+2\right)^3\left(5x-9\right)^5\right)$

$\left(2x^2y-y^3\right)^2$