Why is [math]\int x^{-1} \: dx = \ln x + C[/math]?
Why is [math]\int \frac{1}{x^2} dx = -\frac{1}{x}+C[/math]?
מדוע [math]\int x^{-1} הוא \:dx = \ln x + C[/math]?
מדוע [math]\int \frac{1}{x^2} dx = -\frac{1}{x}+C[/math]?