Promblem with integration

[Anders]

parisse,
That would be great!

To complete the picture with cos(x^2), using Euler and variable substitution you can do a similar complex math calculation and derive int(cos(^2)x,0,x) in terms of erf(x) symmetrically as:

int(cos(x^2),x,0,x) =
(1-i)*√(pi/32)*( erf( (1+i)/√(2) * x) + i*erf( (1-i)/√(2) * x) )

It turns out that the signs in front of the two i's are swapped otherwise the same. Very nice actually.