code: def expected(scale, coeffs, n_wires=10, offset=0.1, like="numpy"):
      phase = offset + scale * qml.math.asarray(
          range(n_wires), like=like
      )
      cosines = qml.math.cos(phase)
      sines = qml.math.sin(phase)
      return coeffs[0] * qml.math.prod(cosines) + coeffs[
          1
      ] * qml.math.prod(sines)
  
imports: import pytest
  import numpy
  from scipy.sparse import csr_matrix
  import pennylane
  from pennylane.devices.qubit import simulate
  from pennylane.devices.qubit.measure import measure, state_diagonalizing_gates, csr_dot_products, full_dot_products, get_measurement_function, sum_of_terms_method
label_desc: Use image node_id 2 for calling the TestSumOfTermsDifferentiability obj's underlying member method code with example usage: obj.expected(scale, coeffs, n_wires, offset, like) and returns: unknown