I want to know how the word "ta'manna" is pronounced in Surat Yusuf, verse 11?

The origin of the Almighty's saying: "What is wrong with you that you do not trust us?" is "la ta'manna" with two 'nuns', and it is an anomalous reading. The expressions of the authors regarding the well-known readings differed into three facets: the pure assimilation of one of the two 'nuns' into the other without ishmam (a reading of Abu Ja'far), pure assimilation with ishmam, and ikhfa' (concealment) without assimilation (narrated from the majority). The reality of ishmam in this context is that the vowel is indicated by the movement of the sound, not by an organ, thus making it ikhfa' and not a true assimilation.