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Find |veca-vecb|, if two vector veca and...

Find `|veca-vecb|`, if two vector `veca` and `vecb` are such that `|veca|=4,|vecb|=5` and `veca.vecb=3`

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We have `|veca-vecb|^(2)=(vaca-vecb).(veca-vecb)`
`=veca.veca-veca.vecb-veca.veca+vecb.vecb`
`=|veca|^(2)-2veca.vecb+|vecb|^(2)`
=16-6+25=35
`:. " " |veca-vecb|=sqrt(35)`
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