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 <pubdate><![CDATA[Wed, 02 Jan 2013 14:51:01 +0000]]></pubdate>
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 <description><![CDATA[(X1,Y1),(X2,Y2)
ΔX=X2-X1
ΔY=Y2-Y1
tanθ=Δy/Δx
θ=arctanΔy/Δx]]></description>
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