Write the value of 
.
We know, 
, 
and 
are 3 unit vectors along x, y and z axis whose magnitudes are unity.
We have,
and
And, 
,
and
.
=1+1+(-1)
=1.
1
Write the value of
.
We know, , and are 3 unit vectors along x, y and z axis whose magnitudes are unity.
We have,
and
And, ,
and
.
=1+1+(-1)
=1.