find the distance between the points A and B , if A (a+b , b -a )and B ( a - b. a+b )
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√(x2-x1)²+(y2-y1)²
=√(a+b-(a-b))²+(a+b-(b-a))²
=√(2b)²+(2a)²
=√4b²+4a²
=2b+4a
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