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If a=(hati+hatj+hatk), a.b=1 and axxb=hatj-hatk, then b is |
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Answer» `hati-HATJ+hatk` `andaxxb= hatj= hatk` As , we know ` a XX (AXXB)=(a.b)a-(a.a)b` `IMPLIES ( hati + hatj + hatk ) xx(hatj - hatk ) = ( hati+ hatj + hatk)-3b` `[ :'a.a =1+1+1=3]` `implies- 2 hati+ hatj+ hatk= hati+ hatj + hatk -3b` `implies3b=3 hati` `implies b= hati` |
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