code: def test_chebyt_symmetry():
      x, w = sc.roots_chebyt(21)
      pos, neg = x[:10], x[11:]
      assert_equal(neg, -pos[::-1])
      assert_equal(x[10], 0)
  
imports: import numpy
  from numpy import array, sqrt
  from numpy.testing import assert_array_almost_equal, assert_equal, assert_almost_equal, assert_allclose
  from pytest import raises
  from scipy import integrate
  import scipy.special
  from scipy.special import gamma
  import scipy.special._orthogonal
label_desc: Use image node_id 9 for calling a global function with example usage: test_chebyt_symmetry() without return types