$\frac{\sqrt{2-x}}{2-\sqrt{2+x}}$

$2\left(1\right)^4+\:\left(1\right)^3+\:15\left(1\right)^2+\:9\left(1\right)\:-\:27$

$sin^2\left(x\right)+2cos\left(x\right)+2$

$x^6+x^4-x^2-x$

$\left(3y\right)^2+10y+8$

$\lim_{g\to0}\left(\frac{e^{3g}-1}{\sin\left(g\right)}\right)$

$15\frac{8}{15}x^2-12x+9$