3．（2023春•泗阳县校级月考）已知sinα−sinβ=13\sin \alpha -\sin \beta =\frac{1}{3}sinα−sinβ=31，cosα−cosβ=−223\cos \alpha -\cos \beta =-\frac{2\sqrt{2}}{3}cosα−cosβ=−322，α\alphaα，β∈(0,π2)\beta \in (0,\frac{\pi }{2})β∈(0,2π)，则α−β=(\alpha -\beta =(α−β=( )))