class_docstr: Particle in a box eigenket.
class_docstr_tok: ["Particle","in","a","box","eigenket","."]
code: def dual_class(self):
      return PIABBra
  
imports: from sympy.core.numbers import pi
  from sympy.core.singleton import S
  from sympy.core.symbol import Symbol
  from sympy.functions.elementary.miscellaneous import sqrt
  from sympy.functions.elementary.trigonometric import sin
  from sympy.sets.sets import Interval
  from sympy.physics.quantum.operator import HermitianOperator
  from sympy.physics.quantum.state import Ket, Bra
  from sympy.physics.quantum.constants import hbar
  from sympy.functions.special.tensor_functions import KroneckerDelta
  from sympy.physics.quantum.hilbert import L2
label_desc: Use image node_id 2 for calling the PIABKet obj's underlying member method code with example usage: obj.dual_class() and returns: PIABBra