$\lim_{x\to0}\left(\frac{-sin\left(4x^4\right)}{x}\right)$

$\int\left(\frac{\left(1-4x\right)}{\left(4x^2-2x+6\right)}\right)dx$

$\left(3a+2b^2+c\right)^2$

$\left(4x+12\right)+\left(7y+7\right)$

$9r^22-6r+1$

$\frac{2a\left(3a-4b\right)}{a}$

$\lim_{x\to3}\left(\frac{x^2-9}{\left(x-2\right)\left(x-3\right)}\right)$