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If |veca|=1,|vecb|=1,|vec(c)|=2 and veca...

If `|veca|=1,|vecb|=1,|vec(c)|=2 and vecaxx(vecaxxvec(c))+vecb=0` then find the angle between `veca and vec(c)`.

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The correct Answer is:
`30^(2)` or `150^(@)`.
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