Помогите разложить на множители пожалуйста:
1) 4x^2-4xy+y^2-9
2)ac^4-c^4-ac^2+c^2
3)4-m^2+2mn-n^2
1) 4x^2-4xy+y^2-9
2)ac^4-c^4-ac^2+c^2
3)4-m^2+2mn-n^2
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Answers & Comments
(2x-y-3)(2x-y+3)
2)c^2(ac^2-c^2-a+1)
c^2(a-1)(c^2-1)
c^2(a-1)(c-1)(c+1)
3)4-(m^2-2mn+n^2)
4-(m-n)^2
(2-m+n)(2+m-n)