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4x^2n-1/9
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(2x^n-1/3)(2x^n+1/3)
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a^4n-225b^4
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(a^2n-15b^2) (a^2n+15b^2)
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16x^6m-y^2n/49
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(4x^3m-y^n/7)(4x^3m+y^n/7)
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49a^10n-b^12x/81
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(7a^5n-b^6x/9)(7a^5n+b^6x/9)
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(x+y)^2-a^2
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[(x+y)-a] [(x+y)+a]
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x^2 - 9
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(x + 3)(x - 3)
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x^2 - y^2
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(x + y)(x - y)
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x^2 - 9/25
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(x + 3/5) (x - 3/5)
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x^6 - 4
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(x^3 + 2).(x^3 - 2)
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36x^2 - a^6b^4
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(6x + a^3b^2)(6x - a^3b^2)
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4 - x^2
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(2 + x)(2 - x)
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b^2 - 1
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(b + 1)(b - 1)
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x^2 - 4/25
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( x + 2/5)( x -2/5)
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16m^2 -9n^2
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( 4m + 3n )( 4m -3n)
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25x^4/36 - 16y^4/9
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( 5x^2/6 + 4y^2/3) (5x^2/6 - 4y^2/3)
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x^6/49-4a^10/121
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(x^3/7-2/n)(x^3/7+2/n)
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100m^2 n^4-1/16×8
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(10mn-1/4 x^4 )
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a^2n-b^2n
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(a^n-b^n )
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81 – x^2
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(9+x)(9-x)
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x^2-49
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(x+7)(x-7)
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