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b. 4-√2/4+√2 . 4-√2/4-√2 = 16-8√2+2/14 = 18-8√2/14 = 9-4√2/7
c. 2a/3a+√5 . 3a-√5/3a-√5 = 6a²-2a√5/9a²-5