1a-2 + a+2a2+2a+4
=a2+2a+4+(a+2)(a-2)(a-2) (a2+2a+4)
=a2+2a+4+a2-22(a-2) (a2+2a+4)
=a2+2a+4+a2-4(a-2) (a2+2a+4)
=2a2+2aa3-23
=2(a2+a)a3-8
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