find the distance between the point R(a+b,a-b)S(a-b,-a-b)
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√((a-b)-(a+b))²+((a-b)-(a-b))²{distance formula}
√(a-b-a-b)²+(a-b-a+b)²
√(-b)²+(0)²
= -b
√(a-b-a-b)²+(a-b-a+b)²
√(-b)²+(0)²
= -b
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