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दिखाइये कि सदिश `vec(A)=2hat(i)-3hat(j)-hat(k)` तथा `vec(B)=-4hat(i)+6hat(j)+2hat(k)` परस्पर समांतर है ।

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दो सदिश समांतर होंगे यदि उनका सदिश गुणन शून्य है
प्रश्नानुसार, `vec(A)=2hat(i)-3hat(j)-hat(k)," "vec(B)=-4hat(i)+6hat(j)+2hat(k)`
`vec(A)xxvec(B)=|{:(hat(i),hat(j),hat(k)),(2,-3,-1),(-4,6,2):}|`
`=hat(i)-(-6+6)-hat(j)(4-4)+hat(k)(12-12)`
`=-0+0=0`
अतः `vec(A)` व `vec(B)` परस्पर समांतर है

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