Given a + B = 2, ab = 1, find the quadratic power of (1) a + B; (2) the quadratic power of (a-b)

a+b=2,ab=1,
(1) The quadratic power of a + B
a²+b²=﹙a+b﹚²﹣2ab=4-2=2
The second power of (2) (a-b)
﹙a-b﹚²=a²+b²-2ab=2-2=0

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