Question

$\displaystyle\int\frac{du}{1+u}=?$

Answer 1

$ln|1+u|+c$dur şöyle 

$\int \frac{1}{1+u}d(u+1)$=...$(u+1=x )$...=$\int\frac{1}{x}dx$=$ln(x)+c$=$ln(u+1)+c$