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Let a, b, c, d be real numbers between â...

Let a, b, c, d be real numbers between – 5 and 5 such that `|a|=sqrt(4-sqrt(5-a)),|b|=sqrt(4+sqrt(5-b))`,
`|c|=sqrt(4-sqrt(5+c)),|d|=sqrt(4+sqrt(5+d)),`.
Then the product abcd is

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