Q. 3 D5.0( 1 Vote )

Simplify, using t

Answer :

First, we consider sin 50° 26’,


We write sin 50° 26’ = sin 50° 24’ + 2’.


The relevant part of the sine table is given below.



From the table, we have


Sin 50° 24’ = 0.7705


Mean difference for 2’ = 0.0004


We know that mean difference is to be added in the case of sine.


sin50° 26’ = 0.7705 + 0.0004 = 0.7709


Now consider cos 18°,


The relevant part of the cosine table is given below.



From the table, we have


cos 18° = 0.9511


Then consider tan 70° 12’,


The relevant part of the tangent table is given below.



From the table, we have


tan 70° 12’ = 2.7776


sin 50° 26’ + cos 18° + tan 70° 12’ = 0.7709 + 0.9511 + 2.7776 = 4.4996


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