$$\frac{d}{dx}\left(\left(x-5\right)\left(3x+7\right)\right)$$

$$\lim_{x\to0}\left(\frac{\ln\left(1+x\right)-x+\frac{x^2}{2}-\frac{x^3}{3}}{x^3}\right)$$

$$\frac{1}{\pi}\int_0^{\pi}\left(\left(\pi-x\right)sen\:nx\right)dx$$

$$\frac{d^2}{dx^2}\left(b^2x^2+a^2y^2\right)$$

$$\int\frac{10}{36x^2+1}dx$$