Find the unit vector in the direction of vector \(\rm \vec{a}= 3\hat i -4\hat j+12\hat k\)
1
\(\rm \frac{3}{13} \hat i + \frac{4}{13} \hat j + \frac{12}{13} \hat k\)
2
\(\frac{1}{9} \hat i - \frac{4}{9} \hat j + \frac{8}{9} \hat k\)
3
\(\rm \frac{3}{13} \hat i - \frac{4}{13} \hat j + \frac{12}{13} \hat k\)
4
\(\rm \frac{3}{13} \hat i + \frac{4}{13} \hat j - \frac{12}{13} \hat k\)