Answer:
1.=(a+b)(a+b)
=a(a+b)+b(a+b)
=a²+ab+ba+b²
=a²+2ab+b²
=ab=ab
2.=a²-b²-2ab
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Answer:
1.=(a+b)(a+b)
=a(a+b)+b(a+b)
=a²+ab+ba+b²
=a²+2ab+b²
=ab=ab
2.=a²-b²-2ab