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The vector hat i+x hat j+3 hat k is rot...

The vector ` hat i+x hat j+3 hat k` is rotated through an angle `theta` and doubled in magnitude, then it becomes `4 hat i+(4x-2)dot hat j+2 hat k` . Then value of `x` are `-2/3` (b) `1/3` (c) `2/3` (d) 2

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