What is obligatory is to say “Subhaana Rabbiy al-A’laa (Glory be to my Lord Most High), as is obligatory during the prostration of prayer. Any additional du’aa’ or dhikr is mustahabb.
Sujood al-tilaawah, whether during prayer or outside of it, is Sunnah, not obligatory, because evidence to that effect was narrated from the Prophet (peace and blessings of Allaah be upon him), in the hadeeth of Zayd ibn Thaabit and in the hadeeth of ‘Umar (may Allaah be pleased with him).
The prostration in these verses is mustahabb for the reader and the listener, and it is not obligatory. If a person wants to prostrate he should say takbeer, then say in his prostration what he says when he prostrates in prayer, then get up without saying takbeer or tashahhud or salaam. If the prostration of recitation comes during a prayer, then he should say takbeer when standing up again. See more details on that in the answers to questions no. 22650 and 4890.
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