`veca,vecb,vecc` be three vectors such that `veca+vecb+vecc=0' and '|veca|=

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`veca,vecb,vecc` be three vectors such that `veca+vecb+vecc=0" and "|veca|=1,|vecb|=4,|vecc|=2`. Evalute `veca*vecb+vecb*vecc+vecc*veca`.
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