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VECTOR ALGEBRA
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�Note   One may note that l2 + m2 + n2 = 1 but a2 + b2 + c2 ≠ 1, in general 10 3  Types of Vectors
Zero Vector A vector whose initial and terminal points coincide, is called a zero
vector (or null vector), and denoted as 0
r Zero vector can not be assigned a definite
direction as it has zero magnitude