$\frac{3x^3-17x^2+27x+28}{x-4}$

$\frac{y^2+y-20}{y^2+17y+72}$

$\lim_{x\to0}\left(\frac{\cos\left(3x\right)}{sin\left(2x\right)}\right)$

$\left(\frac{10}{7}x^5y^2+\frac{1}{5}x^3y^4\right)^2$

$\lim_{x\to0}\left(\frac{3x^2+8x+20}{x-5}\right)$

$\sin\infty\left(\cos\infty-\sin\infty\right)$

$9m^2-16m$