(1 + 3/2·a·b)·(1 - 3/2·a·b) = 1 - 9·a^2·b^2/4
(1/3·x^2 - y)·(1/3·x^2 + y) = x^4/9 - y^2
(2 - 2/5·x)·(2 + 2/5·x) = 4 - 4·x^2/25
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