1.

Let vec(a)=hati+hatj+hatk,vec(b)=hati and vec( c )=c_(1)hati+c_(2)hatj+c_(3)hatk. Then If c_(1)=1 and c_(2)=2 find c_(3) which makes vec(a),vec(b) and vec( c ) coplanar.

Answer»


ANSWER :`:.-c_(3)+2=0=>c_(3)=2`


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