Answer :

We write cos 12° 35’ = cos 12° 30’ + 5’.


The relevant part of the cosine table is given below.



From the table, we have


cos 12° 30’ = 0.9763


Mean difference for 5’ = 0.0003


We know that mean difference is to be subtracted in the case of cosine.


cos 12° 35’ = 0.9763 - 0.0003 = 0.9760


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