$$1-2\left(3x\right)^{2}\left(5\right)$$

$$\frac{2x^2}{\left(x+1\right)\left(x+2\right)}$$

$$y'=y+\sqrt{y}$$

$$\int\frac{6x^2+6}{x^2+2x+4}dx$$

$$\left(2ax-9\right)\left(2ax-3\right)$$

$$\lim_{x\to0}\left(\frac{\sqrt{h}}{h}\right)$$

$$9f+10f+12f$$