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If |veca|=|vecb|=|vecc|=1 and veca*vecb=...

If `|veca|=|vecb|=|vecc|=1 and veca*vecb=vecb*vecc=vecc*veca=1/2`, then the value of `4[veca vecb vecc]^2` is:

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MODERN PUBLICATION-EXCLUSIVELY FOR JEE(ADVANCED)-EXERCISE
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