Question 983729
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Point A=({{{x[1]}}},{{{y[1]}}})=(3,9); Point B=({{{x[2]}}},{{{y[2]}}})=(3,-4)
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{{{distance=sqrt((x[2]-x[1])^2+(y[2]-y[1])^2)}}}
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{{{distance=sqrt((3-3)^2+(-4-9)^2)}}}
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{{{distance=sqrt(0+(-13)^2)}}}
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{{{distance=sqrt(169)}}}
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{{{distance=13}}}