AB+AC+AD+EA+FA=4AB .prove it by vector method
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assume you mistyped the problem, it meant: ab+ac+ad+ea+fa=4ab where each quantity is a VECTOR.
first, note AB+BC=AC and
AD=AB+BC+CD and
EA (note direction, from E to A)=-(AB+BC+CD+DE) and
FA=-(EF+AE)
yogitakambleyk19:
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