$\left(3-a\right)\left(2-a\right)\left(3-a\right)$

$cos\left(sin^{-1}\left(9x\right)\right)$

$\left(x^5+x^2+2x\right)$

$2x+1\ge5$

$\int\frac{2}{\left(4x^2+1\right)^2}dx$

$\lim_{x\to0}\left(\frac{\sin\left(0x\right)}{x}\right)$

$\int-\frac{2}{\left(x-1\right)\left(x+1\right)}dx$