Possible Duplicate:
Evaluating $\int_0^\infty \sin x^2\, dx$ with real methods?
How to calculate $\displaystyle\int_{0}^{+\infty} {\sin {x^2}\mathrm{d}x}$ ?
Possible Duplicate:
Evaluating $\int_0^\infty \sin x^2\, dx$ with real methods?
How to calculate $\displaystyle\int_{0}^{+\infty} {\sin {x^2}\mathrm{d}x}$ ?