99square99 without actual multiplication
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(a-b)^2 = a^2 + b^2 - 2ab
99×99
(100-1)^2
(100)^2 + (1)^2 - 2×100
10000 + 1 - 200
9801
99×99
(100-1)^2
(100)^2 + (1)^2 - 2×100
10000 + 1 - 200
9801
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