Define \[f(x) = (x-1)(x-3)(x-7)(x-9).\]Evaluate $f(6) - f(4)$.
Question:
Define \[f(x) = (x-1)(x-3)(x-7)(x-9).\]Evaluate $f(6) - f(4)$.
Answer:
Let's think step by step.

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Define \[f(x) = (x-1)(x-3)(x-7)(x-9).\]Evaluate $f(6) - f(4)$.
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