1.

If a vector a expressed as the sum of two vectors vec(alpha) and vec(beta) along and perpendicular to a given vector b, then vec(beta) =

Answer»

`((a XX B)xxb)/(|b|^(2))`
`(b xx(a xx b))/(|b|^(2))`
`(b xx (a xx b))/(|b|)`
((a.b)/(|b|^(2)))b`

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