code: def fuse_rot_angles(angles_1, angles_2):
      """Computed the set of rotation angles that is obtained when composing
      two ``qml.Rot`` operations.
  
      The ``qml.Rot`` operation represents the most general single-qubit operation.
      Two such operations can be fused into a new operation, however the angular dependence
      is non-trivial.
  
      Args:
          angles_1 (float): A set of three angles for the first ``qml.Rot`` operation.
          angles_2 (float): A set of three angles for the second ``qml.Rot`` operation.
  
      Returns:
          array[float]: Rotation angles for a single ``qml.Rot`` operation that
          implements the same operation as the two sets of input angles.
      """
  
      # Check if we are tracing; if so, use the special conditionals
      if is_abstract(angles_1) or is_abstract(angles_2):
          interface = get_interface(angles_1, angles_2)
  
          # TODO: implement something similar for torch and tensorflow interfaces
          # If the interface is JAX, use jax.lax.cond so that we can jit even with conditionals
          if interface == "jax":
              from jax.lax import cond
  
              return cond(
                  allclose(angles_1[1], 0.0)
                  * allclose(angles_2[1], 0.0),
                  _no_fuse,
                  partial(_fuse, abstract_jax=True),
                  angles_1,
                  angles_2,
              )
  
      # For other interfaces where we would not be jitting or tracing, we can simply check
      # if we are dealing with the special case of Rot(a, 0, b) Rot(c, 0, d).
      if allclose(angles_1[1], 0.0) and allclose(angles_2[1], 0.0):
          return _no_fuse(angles_1, angles_2)
  
      return _fuse(angles_1, angles_2)
  
file_path: pennylane/pennylane/transforms/optimization/optimization_utils.py
imports: from functools import partial
  import numpy
  from pennylane.math import abs
  from pennylane.math import sum
  from pennylane.math import allclose, arccos, arctan2, cos, get_interface, is_abstract, sin, stack
  from pennylane.wires import Wires
  from pennylane.ops.identity import GlobalPhase
label_desc: Use image node_id 8 for calling a global function with example usage: fuse_rot_angles(angles_1, angles_2) and returns: _fuse, _no_fuse, cond