$y=x\left(x+2\right)\left(x-9\right)$

$\left(x^2-2x+1\right)\left(x^4-2x^2+2\right)$

$\frac{x^3+x^2-2x}{x+2}$

$\lim_{x\to-3}\left(\frac{\sqrt{5+x}}{x-3}\right)$

$\log\left(3x-2\right)+\log\left(x+1\right)=2-\log\left(2\right)$

$\tan\left(5-\sin2x\right)$

$2\sin\left(t\right)^2+4\cos\left(t\right)$