$3x^2-9x+12$

$\lim_{x\to0}\left(\frac{e^{2x}-1}{3x^2+4}\right)$

$\left[3\left(x+4\right)-2\left(2x-3\right)\right]\left[\left(x+4\right)-5\left(2x-3\right)\right]$

$\tan\left(u\right)+\cot\left(u\right)=2\csc\left(2u\right)$

$\int\left(9i-4tj+ln\left(t\right)k\right)dt$

$\lim_{x\to-1}\left(-x^3+2x^2-5x+2\right)$

$\sqrt{16m^2z^{-4}}x^{11}$