Question

Determine the value of cos 79 15' (cosine of 79 degrees, and 15 minutes). In this case, minutes are 1/60 of a degree.

Answer 1

Note that 79 degrees 15 minutes = 79.25 degrees.

cos 79.25 degrees = 0.187.

Answer 2

We have to determine the value of
`\cos 79^(\circ) 15'`

Firstly we will find the value of
`79^(\circ) 15'`

`79^(\circ) 15'`

=
`79^(\circ) + 15'`

Since 1 minute =
`(1)/(60)^(\circ)`

`=79^(\circ) + (15)/(60)^(\circ)`

`=79^(\circ) + 0.25^(\circ)`

`=79.25^(\circ)`

Now, we have to determine the value of
`\cos 79.25^(\circ)`

Now, we will use calculator to find the value of
`\cos 79.25^(\circ)`

So we get as,

`\cos 79.25^(\circ)` = 0.1865

= 0.187 (Rounded)