$$\log\left(x^5\right)-\log\left(x^3\right)=4$$

$$\lim_{x\to3}\left(\frac{x^5-9}{x-3}\right)$$

$$8x^2-20x-4x+10$$

$$sin^2\theta\:\left(1+tan^2\theta\:\right)=tan^2\theta\:$$

$$5\sqrt{98}-3\sqrt{18}$$

$$\cos\alpha\cdot sen2\alpha=sen\alpha$$

$$q\log_x\left(y\right)$$