$$8a^2b-4b^2$$

$$\frac{d}{dx}\left(3y+2\right)^3=7x^3-3x$$

$$\left(+\sqrt{x^2+y^2}\right)-\left(-\sqrt{x^2+y^2}\right)$$

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

$$\left(\sqrt{2x^2}\right)^4$$

$$x^2-5x-5$$

$$\frac{\left(\tan^2\left(x-1\right)\right)}{\left(\tan^2\left(x+1\right)\right)}\cdot2\cos^2\left(x\right)$$