1. Find DirectionCosines(A)
`A=(1,2,2)`,`C=(1,2,2)`

Solution:
Here `vec A=(1,2,2),vec B=(2,2,1),vec C=(1,2,2)`


1. Calculate the magnitude(length) of vector `vec A`

`|vec A|`

`=sqrt(A_1^2 + A_2^2 + A_3^2)`

`=sqrt(1^2 + 2^2 + 2^2)`

`=sqrt(1 + 4 + 4)`

`=sqrt(9)`

`=3`


2. Calculate the direction cosines of vector `vec A`

`cos alpha=(A_1)/(|vec A|)=1/3=0.3333`

`cos beta=(A_2)/(|vec A|)=2/3=0.6667`

`cos gamma=(A_3)/(|vec A|)=2/3=0.6667`