$$2\ln x-\ln\left(x+2\right)=0$$

$$\int\left(4x^2+2\right)\ln\left(x\right)dx$$

$$\int\left(\frac{2x+5}{x^2+4x-12}\right)dx$$

$$\int_4^4\sqrt{5+4x-x^2}dx$$

$$2\cdot\left(15-3\right)-\left(11-\left(7-3\right)\right)$$

$$\left(ex\right)^2$$

$$x^2\left(\frac{dy}{dx}\right)-y\sqrt{x}=0$$