What is [math]\int \frac{1}{e^x + e^{-x}} dx[/math] ?
What is the [math]\int {\frac{1}{{\sqrt {2{x^2} + 8x} }}dx} [/math]?
מה זה [math]\int \frac{1}{e^x + e^{-x}} dx[/math] ?
מהו ה-[math]\int {\frac{1}{{\sqrt {2{x^2} + 8x} }}dx} [/math]?