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If veca=hati-2hatj-3hatk and vecb =-hati...

If `veca=hati-2hatj-3hatk` and `vecb =-hati +hat j-hatk` then find the following :`(i) |veca| (ii) veca.vecb (iii)veca xx vecb` (iv) projection of `vecb` on `veca.`

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