- #1

tnutty

- 326

- 1

In my integral I have some integrand* dy.

Say I wanted to change the dy to dx.

From what's given :

y = sqrt(x);

dy = 1/(2sqrt(x) ) dx;

I could just substitute that instead for dy.

But what's the difference if I do this :

y = sqrt(x)

y^2 = x

2y dy = dx

dy = dx/2y

So how is the former different from the latter. I mean I see that y is integrated for the

second one, but what does it represent? Can you explain me the difference between the

two, does not have to be geometrically, but will be appreciated.