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    				| 1. | यदि `oversetto a=3hati + 2hatj +2hatk ,oversetto b =-hati +3hatj +hatk ` तथा `oversetto c =hati+hatj +hatk ` तो `oversetto axx(oversetto b xxoversetto c ) ` का मान ज्ञात कीजिए| | 
| Answer» हम जानते है की ` " "oversetto axx(oversetto bxxoversetto c) =(oversetto a *oversetto c)oversetto b -(oversetto a *oversetto b )oversetto c " "...(1)` अब ` oversetto a*oversetto c=(3hati +2hatj +2hatk )*(hati +hatj +hatk )` ` " "= 3xx1+2xx1+2xx1=3+2+2=7` ` oversetto a*oversetto b =(3hati +2hatj +2hatk )*(-hati +3hatj -hatk ) ` ` " " =3 (-1) +2(3)+2(-1)=-3+6-2=1` ये सभी मान समीकरण (1 )में रखने पर `oversetto a xx(oversetto bxxoversetto c) =7oversetto b -1oversetto c=7(-hati +3hatj-hatk)- (hati +hatj+hatk ) ` ` " "7hati+21hatj-7hatk-hati -hatj-hatk ` ` " "=-8hati+20hatj -8hatk` | |