D Question 27 Which inference rule allow us to introduce a new letter to a proof? [1]. conjunction [2]. disjunction [3]. simplification [4). addition O conjnction O disjunction O simplification O addition

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Q: a. A'n C b. (An B) U D c. (An B) U(CnD) d. (BU C) nD (A U BY е. B.

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Q: = 3e2x and y,, = x² + 3x are respectively solutions of у" - бу' + 5у -9е2х y" – 6y' + 5y = 5x² + 3x…

A: General solution y(g)= y(h)+y(p)

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