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Question: Function not being produced?

Question:Function not being produced?

Hayno 10 Maple 17
October 19 2013
1

Can anybody tell me what error is in the following function?

F:= ([[a,b], [c,d], [e,f]]) -> (1/2) abs((c-a)(f-b)-(e-a)(d-b));

Thank you!
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