$$\int_{-2}^38x^3+9x^2-12x-7\:dx$$

$$5-8x>-3$$

$$5x^4-6x^3+8x^2+8x^2+9x$$

$$6x^2-3y^2=1$$

$$f\left(x\right)=\sqrt{\frac{1+senx}{1-senx}}$$

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

$$\frac{dy}{dx}=\frac{y-\frac{1}{y}}{x}$$