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[" (17) A,"B,C,D" and "E" are five copla...

[" (17) A,"B,C,D" and "E" are five coplanar points,then "],[" DA "+" DB "+" DC "+A" E "+BE+CE" is equal to "],[[" (a) "DE," (b) "3DE],[" (c) "2" DE "," (d) "4" ED "]]

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