What I meant was that if you write sqrt(a) x = y you get an integral in y (that does not depend on a) times 1/sqrt(a). It doesn’t require anything except knowi

What I meant was that if you write sqrt(a) x = y you get an integral in y (that does not depend on a) times 1/sqrt(a). It doesn’t require anything except knowing how to change variables in an integral, you don’t have to actually be able to do the integral.