code: def test_Limits_simple_3a():
      a = Symbol("a")
      # issue 3513
      assert together(
          limit((x**2 - (a + 1) * x + a) / (x**3 - a**3), x, a)
      ) == (a - 1) / (3 * a**2)
  
imports: from sympy.core.numbers import Rational, oo, pi
  from sympy.core.singleton import S
  from sympy.core.symbol import Symbol
  from sympy.functions.elementary.exponential import exp, log
  from sympy.functions.elementary.miscellaneous import root, sqrt
  from sympy.functions.elementary.trigonometric import asin, cos, sin, tan
  from sympy.polys.rationaltools import together
  from sympy.series.limits import limit
label_desc: Use image node_id 7 for calling a global function with example usage: test_Limits_simple_3a() without return types