Which Supreme Court case decided that compulsory prayer in public schools was unconstitutional?

Question

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Engel v. Vitale was a landmark Supreme Court case in 1962 that declared that prayer in public schools, even if it is not mandatory, violates the Establishment Clause of the First Amendment. The decision declared that the state cannot hold prayers in public schools, even if participation is not compulsory and the prayer is not tied to a particular religion.

Which Supreme Court Case Decided That Compulsory Prayer in Public