Question

A bar=4 i cab +5 j cab+12 k cab,find unit vector of A?

Answer 1

Unit vector  A = $\frac{A}{{|A|}}$

|A| = √(4² + 5² + 12²) = 1/√185

$\frac{A}{{|A|}}$  = $\frac{1}{\sqrt{185} }$ × (4i + 5j + 12k)