find the distance between the point r(a+b,a-b)s(a+b,-a-b)
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√[{(a+b)-(a+b)}sqare + {(a-b)-(-a-b)}sqare]
= √[a-b+a+b]sqare
= √(a) sqare = a
= √[a-b+a+b]sqare
= √(a) sqare = a
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