$$\lim_{x\to3}\left(\frac{x^2-9}{-3\sqrt{x-2+x}}\right)$$

$$\cos^2\left(x\right)-\sin^2\left(y\right)$$

$$\left(-2x-9y^2\right)\left(-4x-3\right)$$

$$x\:3\:x\:+\:4x$$

$$\frac{dy}{dx}=\frac{\left(338-e^x\right)}{3+2y}$$

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

$$\int\frac{4x}{8x+1}dx$$