$9f^2+6f-1$

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

$3x\left(2x+3y\right)-4y\left(2x-2y\right)+xy\left(8-y\right)$

$\frac{d^2}{dx^2}\left(2xy^2\right)$

$-25\cdot31$

$\left(\frac{a}{3}+3a^2\right)^5$

$\int\left(2tan\left(7x+3\right)+7\right)^6\left(98\sec\left(7x+3\right)^2\right)dx$