def _meijerint_definite_2(f, x):
 dummy = _dummy('x', 'meijerint-definite2', f, positive=True)
 f = f.subs(x, dummy)
 x = dummy
 if (f == 0):
  return (S(0), True)
 for (g, explanation) in _guess_expansion(f, x):
  _debug('Trying', explanation)
  res = _meijerint_definite_3(g, x)
  if res:
   return res

def _meijerint_definite_2 ( f , x ) : dummy = _dummy ( 'x' , 'meijerint-definite2' , f , positive = True ) f = f . subs ( x , dummy ) x = dummy if ( f == 0 ) : return ( S ( 0 ) , True ) for ( g , explanation ) in _guess_expansion ( f , x ) : _debug ( 'Trying' , explanation ) res = _meijerint_definite_3 ( g , x ) if res : return res
try to integrate f dx from zero to infinty .