Assume 
……….(i)
= 
……….(ii)
Now, from eq. (i), 
= 
Here, 
and 
, then 
= 
Since, 
and 
is approximately equal to 
and 
respectively.
From eq. (ii),
= 0.03
Therefore, approximately value of 
is 5 + 0.03 = 5.03.
(ii) 
Let ……….(i)
=
……….(ii)
Now, from eq. (i),
= 
Here, 
and 
, then
= 
Since, and is approximately equal to and respectively.
From eq. (ii), 
= 0.0357
Therefore, approximately value of is 7 + 0.0357 = 7.0357.