1.

if vec = 2hati+hatj-hatk, vecb = -hati+2hatj-4hatk, vecc = hati+hatj+hatk, find (vecaxxvecb).(vecaxxvecc).

Answer»

SOLUTION :

=`2hati-3hatj+hatk(VECAXXVECB).(vecaxxvecc)`
`(2hati-9hatj+5hatk).(2hati-3hatj+hatk)`
=-4-27+5 = -26.


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