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Let vec(a)=hat(i)+hat(j)+hat(k),vec(b)=h...

Let `vec(a)=hat(i)+hat(j)+hat(k),vec(b)=hat(i)and vec(c)=c_(1)hat(i)+c_(2)hat(j)+c_(3)hat(k).`" If "c_(1)=1 and c_(2)=2" find "c_(3)" such that "vec(a), vec(b) and vec(c)" are coplanar. "`

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