code: def test_atan():
      a = atan(interval(0, 1))
      assert a.start == np.arctan(0)
      assert a.end == np.arctan(1)
      a = atan(1)
      assert a.start == np.arctan(1)
      assert a.end == np.arctan(1)
  
imports: from sympy.external import import_module
  from sympy.plotting.intervalmath import Abs, acos, acosh, And, asin, asinh, atan, atanh, ceil, cos, cosh, exp, floor, imax, imin, interval, log, log10, Or, sin, sinh, sqrt, tan, tanh
label_desc: Use image node_id 5 for calling a global function with example usage: test_atan() without return types