code: def _reshuffle_dct2(x, n, axis, dst=False):
      """Reorder entries to allow computation of DCT/DST-II via FFT."""
      sl_even = [slice(None)] * x.ndim
      sl_even[axis] = slice(0, None, 2)
      sl_even = tuple(sl_even)
      sl_odd = [slice(None)] * x.ndim
      if n % 2:
          sl_odd[axis] = slice(-2, None, -2)
          sl_odd = tuple(sl_odd)
      else:
          sl_odd[axis] = slice(None, None, -2)
          sl_odd = tuple(sl_odd)
      if dst:
          x = cupy.concatenate((x[sl_even], -x[sl_odd]), axis=axis)
      else:
          x = cupy.concatenate((x[sl_even], x[sl_odd]), axis=axis)
      return x
  
imports: import math
  import numbers
  import operator
  import numpy
  import cupy
  from cupy import _core
  from cupy.fft._fft import _cook_shape
  from cupyx.scipy.fft import _fft
label_desc: Use image node_id 3 for calling a global function with example usage: _reshuffle_dct2(x, n, axis, dst) and returns: x