$$\frac{d^2}{dx^2}\left(x^2+y^2-4x+6y+9=0\right)$$

$$-1+3-2-5+3\left[6-2\left(3-8\right)\left(-2-4\right)-6\right]$$

$$\int4x\cdot sin\left(\frac{x}{4}\right)dx$$

$$\frac{5x^{3}+4x+8}{x+3}$$

$$8m^2+12$$

$$\frac{\left(csc^2\theta\:\right)}{sec^2\theta\:\:}$$

$$2a-6-ab^2+3b^2$$