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demo1
Identités remarquables #1 ⟳
✔ y2 - 25 = ➡ (y + 5)(y - 5)
✔ (a - 4)2 = ➡ a2 - 8a + 16
✔ (b - 2)(b + 2) = ➡ b2 - 4
✔ c2 + 8c + 16 = ➡ (c + 4)2
