$$\frac{\left(2x^{-2}\right)\left(3yxz^2\right)^2}{z^2}$$

$$8+x=13$$

$$\frac{s}{6}+12\ge9$$

$$18v=270$$

$$sin\left(x\right)cos\left(x\right)=\frac{cos\left(x\right)-cos^3\left(x\right)}{sin\left(x\right)}$$

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

$$-2\left(2x^3-4x^2-4x+5\right)$$