code: def test_tanh():
      a = tanh(interval(-3, 3))
      assert a.start == np.tanh(-3)
      assert a.end == np.tanh(3)
  
      a = tanh(3)
      assert a.start == np.tanh(3)
      assert a.end == np.tanh(3)
  
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 14 for calling a global function with example usage: test_tanh() without return types