# Hard integrals

OK, I'm also stuck with these two:

$$\int_0^{\infty} \sin(x) atan\left( \frac{1}{x} \right) \mbox{d}x$$

$$\int_0^{\infty} \frac{1}{x} \sin( \tan(x)) \mbox{d}x$$

I've tried u=sin(x) for the first one and IBP with no result. For the second one I've tried u =tan(x) and IBP.