4d² + 4d + 1 = (2d)² + 2 * 2d * 1 + 1² = (2d + 1)² = (2d + 1)(2d + 1)
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4d² + 4d + 1 = (2d)² + 2 * 2d * 1 + 1² = (2d + 1)² = (2d + 1)(2d + 1)