यदि `vec(a) = 4hat(i)+3hat(j)` तथा `hat(b) =3 hat(i) +4hat(j)` हो तो निम्न के परिमाण ज्ञात कीजिए -
`vec(a)-vec(b)`

Explanation

` vec(a) -vec(b) = (4 hat(i) +3 hat(j))- ( 3hat(i) +4hat(j))`
` = (4-3) hat(i) + (3 -4) hat(j) = hat(i) - hat(j) `
` :. | vec(a) - vec(b) | = sqrt( (1)^(2) +(-1)^(2)) = sqrt(2)`