distance between P(a+b, a-c) and Q(a-b, a+b)
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√(a-b-a-b)² -(a+b-a+c)²
= b² - (b+c)²
b²-b²-c²-2bc
c²-2bc
= b² - (b+c)²
b²-b²-c²-2bc
c²-2bc
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