def subtract_vect(a, b):
    """
    subtract vector b from vector a
    Deprecated, use mpmath instead!!!
    :param a: [float, float, float]
    :param b: [float, float, float]

    >>> subtract_vect([1, 2, 3], [3, 2, 2])
    (-2, 0, 1)
    """
    return (a[0] - b[0],
            a[1] - b[1],
            a[2] - b[2])