Can someone explain the meaning/use/importance of dx in the following substitution?
The original problem is ∫2x1+x2dx
Then u is set to u=1+x2
And finally du is set to du=2xdx
My question is: when setting du=2xdx, what does the dx mean and what role does it play in the solution? I can use it to solve these problems because that's what the book says, but I don't fully understand the meaning/role of it.
The original problem is ∫2x1+x2dx
Then u is set to u=1+x2
And finally du is set to du=2xdx
My question is: when setting du=2xdx, what does the dx mean and what role does it play in the solution? I can use it to solve these problems because that's what the book says, but I don't fully understand the meaning/role of it.