Trinomial expansion refers to the process of expanding expressions that are raised to a power and involve three terms, typically represented in the form \((a + b + c)^n\), where \(a\), \(b\), and \(c\) are the terms and \(n\) is a non-negative integer. The formula for expanding a trinomial can be derived from the multinomial theorem, which generalizes the binomial theorem (the latter which deals only with two terms).
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