A $q$-analogue of Gosper's strange evaluation of the hypergeometric series

Abstract: In 1977, Gosper conjectured many strange evaluations of hypergeometric series. One of them is a ${}{2}F{1}$-series identity with two free parameters, which was proved by Ebisu (2013), Chu (2017), and Campbell (2023) in different ways. In this paper, we present a $q$-analogue of the ${}{2}F{1}$-series identity, along with its generalization, by using three-term relations for the ${}{2}\phi{1}$ basic hypergeometric series.