You can calculate the square of a number like this: 23^2 = (20 + 3)^2 = 20^2 + 3^2 + 2*20*3 = 400 + 9 + 2*60 = 409 + 120 = 529. Now do the same for 73^2. Provide your response in exactly 3 paragraphs (separated nearby paragraphs with 3 aterisk symbols ***).
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