$$445\:-127$$

$$\left(2x+\sqrt[2]{5}\right)\left(2x-\sqrt[2]{5}\right)$$

$$5n+4\ge6n-5$$

$$\int\frac{x^2+6x}{\left(x+2\right)^2+9}dx$$

$$yx^2dx-\left(x^3y^3\right)dy=0$$

$$\left(2senx-1\right)\left(senx-1\right)=0$$