def _guess_expansion(f, x):
    """ Try to guess sensible rewritings for integrand f(x). """
    from sympy import expand_trig
    from sympy.functions.elementary.trigonometric import TrigonometricFunction
    res = [(f, 'original integrand')]

    orig = res[-1][0]
    saw = {orig}
    expanded = expand_mul(orig)
    if expanded not in saw:
        res += [(expanded, 'expand_mul')]
        saw.add(expanded)

    expanded = expand(orig)
    if expanded not in saw:
        res += [(expanded, 'expand')]
        saw.add(expanded)

    if orig.has(TrigonometricFunction, HyperbolicFunction):
        expanded = expand_mul(expand_trig(orig))
        if expanded not in saw:
            res += [(expanded, 'expand_trig, expand_mul')]
            saw.add(expanded)

    return res
dataset/ETHPy150Open sympy/sympy/sympy/integrals/meijerint.py/_guess_expansion/original