(X+3)2, X2+6X+9, (2X-5)2, 4X2-20X+25, (x2 + 4)2, x4 + 8x2 + 16, (3a3- 2b2)2, 9a6-12a3b2-4b4, (5x+6)2, 25x2+60x+36, (4a-7b)2, 16a2-56ab+49b2.

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