Step 1:
We start by applying the binomial theorem, which states that for any real numbers a and b, and any non-negative integer n, we have:
\[(a+b)^n = \sum_{k=0}^{n} \binom{n}{k} a^{n-k} b^k\]
where \(\binom{n}{k}\) is the binomial coefficient, which is equal to
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