(a/a-b-a/a+b)(a+b)(a-b)/2b

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(a/a-b-a/a+b)(a+b)(a-b)/2b(a/a-b-a/a+b)(a+b)(a-b)/2b(a/a-b-a/a+b)(a+b)(a-b)/2b

(a/a-b-a/a+b)(a+b)(a-b)/2b
(a/a-b-a/a+b)(a+b)(a-b)/2b

(a/a-b-a/a+b)(a+b)(a-b)/2b