Define the function $f(x)=\frac{a}{1-x}$. If $f(-1)=f^{-1}(4a+1)$, find the product of all possible values of $a$.
Question:
Define the function $f(x)=\frac{a}{1-x}$. If $f(-1)=f^{-1}(4a+1)$, find the product of all possible values of $a$.
Answer:
Let's think step by step.

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-\frac{1}{2}
Define the function $f(x)=\frac{a}{1-x}$. If $f(-1)=f^{-1}(4a+1)$, find the product of all possible values of $a$.
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