If `vecP=hati+2hatj+6hatk`, its direction cosines are

Options

A. `(1)/(41),(2)/(41)` and `(6)/(41)`
B. `(1)/sqrt(41).(2)/sqrt(41)` and `(6)/sqrt(41)`
C. `(3)/sqrt(41).(8)/sqrt(41)` and `(7)/sqrt(41)`
D. 1,2 and 6

Answer

B

Explanation

`cos alpha=(A_(x))/(|vecA|), cos beta=(A_(y))/(|vecA|), cos gamma=(A_(z))/(|vecA|)`