How to expense $(a+b)^\alpha$ into multinomial with $\alpha \in \mathbb{R}$?
As we all know, the binomial expension is as follows $$ (a+b)^2 = a^2 +2ab
+b^2. $$ When the power number is a real number, not a integral, how to
expense $(a+b)^\alpha$ into multinomial with $\alpha \in \mathbb{R}$?
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