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Let veca = 2 hati+hatj-2hatk, vecb=hati...

Let `veca = 2 hati+hatj-2hatk, vecb=hati+hatj`. If `vecc` is a vector such that `veca*vecc=vecc-veca=2sqrt(2)` and the angle between `|(veca xx vecb) xx vecc|` equals:

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The correct Answer is:
`3/2`
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