`overset(rightarrow)(c).(overset(rightarrow)(a)xxoverset(rightarrow)(b))` का मान ज्ञात कीजिएः यदि `overset(rightarrow)(a)=5hati-4hatj+hatk, overset(rightarrow)(b)=-4hati+3hatj-2hatk, overset(rightarrow)(c)=hati-2hatj-7hatk`

Answer

0

Explanation

`vecaxxvecb=|{:(,hati,hatj,hatk),(,5,-4,1),(,-4,3,2):}|=5hati+6hatj-hatk`
अब `vecc.(vecaxxvecb)=(hati-2hatj-7hatk).(5hati+6hatj-hatk)`
`=1.5+(-2)6+(-7)(-1)`