$$4\cdot4+20\cdot2$$

$$\left(6-3x\right)^2-\left(6+3x\right)^2$$

$$\frac{x^4-2x^2+1}{x^3+2}$$

$$x^5+2x^4-x-8:x^2-2x+1$$

$$\left(2x+y\right)^2+2\left(2x+y\right)+1$$

$$cosx+tanxsenx-senx+tanx=tanx$$

$$\sqrt[3]{\left(4x^2+3x-2\right)}^2$$