def getTOFbetaDeriv(dsp):
    """get derivatives of TOF peak profile beta wrt beta-0, beta-1, & beat-q
    
    :param float dsp: d-spacing of peak
    
    :returns: list getTOFbetaDeriv: d(beta)/d(beat-0), d(beta)/d(beta-1) & d(beta)/d(beta-q)
    
    """
    return 1.0, 1.0 / dsp ** 4, 1.0 / dsp ** 2
