code: def A3():
      diffeq = lambda t, y: y * torch.cos(t)
      init = lambda: (torch.tensor(0.0), torch.tensor(1.0))
      solution = lambda t: torch.exp(torch.sin(t))
      return diffeq, init, solution
  
imports: import math
  import torch
label_desc: Use image node_id 3 for calling a global function with example usage: A3() and returns: diffeq,  init,  solution