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Let vec u be a vector on rectangular ...

Let ` vec u` be a vector on rectangular coordinate system with sloping angle `60^0dot` Suppose that `| vec u- hat i|` is geometric mean of `| vec u|a n d| vec u-2 hat i|,w h e r e hat i` is the unit vector along the x-axis. Then find the value of `(sqrt(2)+1)| vec u|dot`

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