find the product of the following using the identity (a-b)²=a²-2ab+b²
1– (1/2x-x)²
2– (pq²-qp²)²
3– (1-x/2)²
4– (5ab-2b)²
5– (3/7pq-7/3qr)²
6– (72-36)²
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