

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 += [(saw, '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/VarMisuse@115/170 `expanded`->`saw`