evaluate (a / 2b + 2b / a)^2 - (a / 2b - 2b / a)^2 - 4
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hopefully and please thanks
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= [a/2b+2b/a+a/2b-2b/a] [a/2b+2b/a-a/2b+2b/a]-4
= (2a/2b) (4b/a)-4
= 4-4
= 0
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