$$x^2+2x+x$$

$$\int\left(3x\sqrt{x-9}\right)dx$$

$$\frac{x^2+3x}{2}=44$$

$$\left(7x+2yz\right)^2$$

$$\frac{\frac{1}{\cos\:\left(x\right)}}{\frac{\cos\:\left(x\right)\sin\:\left(x\right)}{1}}$$

$$\int_0^{\pi}\left(6x\sin\left(x\right)\right)dx$$

$$x-8\ge3$$