code: def _acos_linear_approximation(
      x: torch.Tensor, x0: float
  ) -> torch.Tensor:
      """
      Calculates the 1st order Taylor expansion of `arccos(x)` around `x0`.
      """
      return (x - x0) * _dacos_dx(x0) + math.acos(x0)
  
imports: import math
  from typing import Tuple
  import torch
label_desc: Use image node_id 2 for calling a global function with example usage: _acos_linear_approximation(x, x0) and returns: unknown