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    Argand diagrams

    just a few tips for argand diagram: 1) mod.z < =a, then the circle should be shaded 2) mod.z < a, then the circle should be shaded+dotted boundary 3) (mod.z -(a-bi)) = (mod.z), then, line should be dotted 4) (mod.z-(a-bi)) < (mod.z), then the line as well as the perpendicular.bisector should...
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    Bio: smoking n diseases- help required

    Hey cud anyone explain "epidemiological evidence" n "experimental evidence"?? every points seem the same...uh.. its boggling my mind. :%) . what points shud we write?
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