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Let a1,a2,....,anbe fixed real numbers ...

Let `a_1,a_2,....,a_n`be fixed real numbers and define a function
`f(x)=(x-a_1)(x-a_2)....(x-a_n)`.
What is `lim_(x->x_1)f(x)`? For some `a!=a_1,a_2,....,a_n`, compute `lim_(x->a)f(x)`

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