2a(x^2+1)^2-2ax^2
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2a(x^2+1)^2-2ax^2
2a(x^2+1)^2-2ax^2
2a(x^2+1)^2-2ax^2
2a(x^2+1)^2-2ax^2
=2a[(x^2+1)^2-x^2]
=2a(x^2+1+x)(x^2+1-x)
2a(x^2+1)^2-2ax^2
2a(x^2+1)^2-2ax^2
2a(x^2+1)^2-2ax^2
2a(x^2+1)^2-2ax^2
=2a[(x^2+1)^2-x^2]
=2a(x^2+1+x)(x^2+1-x)