Hi, I'm trying to derivate this function : . I'm applying this principle : if then . So there I go :
Now I derivate :
But the book says that's not right and the answer should be :
Does anyone see when I went wrong ? Thanks a lot ...
Hi, I'm trying to derivate this function : . I'm applying this principle : if then . So there I go :
Now I derivate :
But the book says that's not right and the answer should be :
Does anyone see when I went wrong ? Thanks a lot ...