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Find |vecaxxvecb|, if veca=2hati-7hatj+7...

Find `|vecaxxvecb|`, if `veca=2hati-7hatj+7hatk` and `vecb=3hati-2hatj+2hatk`

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`veca=hati-7hatjandvecb=3hati+2hatk`
`vecaxxvecb=|{:(hati,hatj,hatk),(1,-7,7),(3,-2,2):}|`
`= hati(-14+14)-hatj(2-21)+hatk(-2+21)=19hatj+19hatk`
`|vecaxxvecb|=sqrt((19)^(2)+(19)^(2))=sqrt(2xx(19)^(2))=19sqrt2`
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