The continuous dual q-Hahn polynomials defined by (3.3.1) simply follow
from the Askey-Wilson polynomials given by (3.1.1) by setting
d = 0 in (3.1.1) :
The Al-Salam-Chihara polynomials defined by (3.8.1) simply follow
from the continuous dual q-Hahn polynomials by taking c = 0 in the
definition (3.3.1) of the continuous dual q-Hahn polynomials :