code: def cospi(x):
      return np.cos(np.pi * x)
  
imports: import math
  from collections import namedtuple
  from typing import Tuple
  import numpy
  from numba import njit
  from numba.typed import List
  from statsmodels.tsa.seasonal import seasonal_decompose
  from .utils import _calculate_intervals, CACHE, NOGIL
label_desc: Use image node_id 10 for calling a global function with example usage: cospi(x) and returns: np