Eid Takbeer (Supplications)
Allahu akbar, Allahu akbar, la ilaha illaAllah
Allahu akbar, Allahu akbar, wa lillahi-lhamd
Other narrations included repeating Allahu akbar 3 times.
As for the popular Takbeerat that adds the extended Salawat of the Prophet (SAW) and his household at the end, that addition needs to have some evidence from the authentic Sunnah to support it. UNTIL THEN, THEY ARE CONSIDERED QUESTIONABLE, i.e., can be considered Bida'h (i.e. creating new ways to perform an act of worship).
As for saying the Takbeerat in unison as an act of worship (e.g. not for teaching/learning purposes), it is against the teachings in the authentic Sunnah and the practice of the Sahabah (may Allah be pleased on them).
May Allah accept our deeds and help us to follow the authentic teachings of the Prophet (SAW), especially, when we are trying to do something good.
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More information about the timing and places of Takbeer
Tags: Eid, Muslim, Islam, Takbeer, Takbir, Supplications, Allahu Akbar, La illaha illah Allah, Wa lillahilhamd