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If bar(a), bar(b), bar(c ) respresents ...

If `bar(a), bar(b), bar(c )` respresents the vertices A, B, and C respectively of `DeltaABC` then prove that `|(bar(a) xx bar(b)) + (bar(b) xx bar(c ))+ (bar(c ) xx bar(a))|` is twice the area of `DeltaABC`.

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