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Step-by-step explanation:
4ysquare-2plus1/4ysquare
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Answer:
(a-b)^2 = a^2 -2ab + b^2. (FORMULA)
(root2y)^2 - 2×root2y×1/root2y + (1/root2y)^2
Therefore when we expand it the answer would be
(root2y - 1/root2y)^2