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

$\frac{d}{dx}\left(2+3x^2\right)^{\ln\left(x\right)}$

$x^2-6^2+9$

$\frac{\sin\left(\frac{x+y}{4}+\cos\left(\frac{x+y}{2}\right)\right)}{\cos\left(x+y-85\right)+\sin\left(x+y-120\right)}$

$\frac{x^4+8x^2+16}{x^2+4}$

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

$-\left(x+1\right)+3\left(x-4\right)$