code: def cossin(self):
      r"""Computes cosine and sine of input via exp(i * x).
  
      Args:
          iterations (int): for approximating exp(i * x)
      """
      return self._eix()
  
imports: import math
  import torch
  from fate.arch.protocol import mpc
  from ..common.util import chebyshev_series
  from ..config import cfg
label_desc: Use image node_id 7 for calling a global function with example usage: cossin() and returns: self