4. Factorise :
(1) 4x2 + 4x + 1 (2) 16x² + 72x+81
(3) 36x2 - 12x +1 (4) 25x2 - 40x + 16
(5) x4 + 6x2 +9 (6) 49x?y- 14xy + 1
(7) 9x2 + 6xy + y2 (8) 64m² - 48mn +9n?
(9) 25x4 + 30x²y2 +9y
(10) 81x4 - 36x2 + 4
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