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Let vecu= hati+hatj, vecv = hati -hatj ...

Let `vecu= hati+hatj, vecv = hati -hatj and vecw = hati+2hatj+3hatk`. If `hatn` is a unit vector such that `vecu.hatn =0 and vecv.hatn=0` then find the value of `|vecw.hatn|`

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