$$x2\:+\:2x\:<\:3\:\:$$

$$2m^2+5m+3$$

$$\left(3xy+7ab\right)\left(3xy-7ab\right)$$

$$\frac{x-5}{x-6}-\frac{x-6}{x-7}$$

$$\frac{30x^4-12x^3+6x^2}{6x^2}$$

$$\sqrt{e^{x^2}}$$

$$\frac{1}{1-\sin^2\left(x\right)}=\tan^2\left(x\right)\left(1+\cot^2\left(x\right)\right)$$