Trigonometric Tables


   
 
Natural Cosine Tables
A part of the natural cosine tables is given below:
 
 
 
Find from the tables the value of
 
(i) cos 37o (ii) cos 37o 42' (iii) cos 37o 45'
 
 
(i) cos 37o Find 37o on the 'Natural Cosines' table in 'A' group. As there are no minutes, the value is read horizontally under the 0' column.
 
cos 37o = 0.7896
 
(ii) cos 37o 42'
 
Look horizontally along 37o column and vertically under 42o in 'B' group.
 
cos 37o 42' = 0.7912
 
(iii) cos 37o 45' As in (ii) read for cos 37o 42'
 
and for 3' read from 'C' group.
 
 
cos 37o 45' = 0.7907
 
To find q when cosine ratio is known
 
 
If , find q
 
 
 
 
The reading can be obtained from t-tables.
 
 
     
   
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