(X6-Y6) 2 (X6-X3Y3+Y6) 2 (X6+X3Y3+Y6)2
=(X6-Y6)2 [(X6-X3Y3+Y6) (X6+X3Y3+Y6)]2
=(X6-Y6)2 [(X6+Y6-X3Y3) (X6+Y6+X3Y3)]2
=(X6-Y6)2 [(X6+Y6)2-(X3Y3)2]2
=(X6-Y6)2 [X12+2X6Y6+Y12 –X6Y6]2
=(X6-Y6)2 [X12+X6Y6+Y12 ]2
=[(X6-Y6) (X12+X6Y6+Y12)]2
=[X18-Y18]2
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