'Returns the angular velocity Vector of the ReferenceFrame.
Effectively returns the Vector:
^N omega ^B
which represent the angular velocity of B in N, where B is self, and
N is otherframe.
Parameters
otherframe : ReferenceFrame
The ReferenceFrame which the angular velocity is returned in.
Examples
>>> from sympy.physics.vector import ReferenceFrame, Vector
>>> N = ReferenceFrame(\'N\')
>>> A = ReferenceFrame(\'A\')
>>> V = 10 * N.x
>>> A.set_ang_vel(N, V)
>>> A.ang_vel_in(N)
10*N.x'

def ang_vel_in(self, otherframe):

    _check_frame(otherframe)
    flist = self._dict_list(otherframe, 1)
    outvec = Vector(0)
    for i in range((len(flist) - 1)):
        outvec += flist[i]._ang_vel_dict[flist[(i + 1)]]
    return outvec
