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Evaluate
(10!+9!)(8!+7!)(6!+5!)(4!+3!)(2!+1!)(10!−9!)(8!−7!)(6!−5!)(4!−3!)(2!−1!).\frac{(10!+9!)(8!+7!)(6!+5!)(4!+3!)(2!+1!)}{(10!-9!)(8!-7!)(6!-5!)(4!-3!)(2!-1!)} . (10!−9!)(8!−7!)(6!−5!)(4!−3!)(2!−1!)(10!+9!)(8!+7!)(6!+5!)(4!+3!)(2!+1!).
Hint: You don't need to multiply out all the factorials!
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