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 = $\frac{1}{60}^{\circ}$

$=79^{\circ} + \frac{15}{60}^{\circ}$

$=79^{\circ} + 0.25^{\circ}$

$=79.25^{\circ}$

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)