simplify the following
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- (a2+b2)(a2+b2)-(a2-b2)(a2-b2)
- a2+b2×a2+b2-a2+b2×a2-b2
- a4+a2b2+b2a2+b4-a4+a2b2+b2a2-b4
- a2b2+b2a2+a2b2+b2a2
- 2(ab+ba+ab+ba)
- 2(2ab+2ba)
- 2×2(ab+ba)
- 4(ab+ba)
- 4×2ab
- 8ab
- or i will tell you later ok
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