$\left(81x^2+108x+36\right)\left(3\right)$

$\int_{-\pi}^0x\sqrt{x^2+a^2}dx$

$\frac{dy}{dx}=-\frac{2xy+24x}{x^2+16}$

$\int\frac{x^2+x+1}{x^3-x^4-x+1}dx$

$\int\left(\frac{4\left(u+1\right)+1}{u^2+2u+1}\right)du$

$\frac{d^2}{dx^2}\left(2+\frac{1}{x}\right)$

$\sqrt[5]{y}^{15}$