def helper_degree_to_radian(f, unit):
    from ..si import degree, radian
    try:
        return ([get_converter(unit, degree)], radian)
    except UnitsError:
        raise UnitTypeError("Can only apply '{0}' function to quantities with angle units".format(f.__name__))
def helper_degree_to_radian(f, unit):
    from ..si import degree, radian
    try:
        return ([get_converter(unit, degree)], radian)
    except UnitsError:
        raise UnitTypeError("Can only apply '{0}' function to quantities with angle units".format(f.__name__))