Chapter SH, Problem 12.16EP

To determine

To find: The exact value of given value.

Answer to Problem 12.16EP

The value of the function $\cos \left(-60\right)°$ is $\frac{1}{2}$ .

Explanation of Solution

Given:

The given function is:

  $\cos \left(-60\right)°$

The value of given function is calculated as:

  $\begin{array}{c}\cos \left(-60\right)°=\cos 60°\left[\because \cos \left(-\theta \right)=\cos \theta \right]\\ =\frac{1}{2}\end{array}$

Therefore the value of the function $\cos \left(-60\right)°$ is $\frac{1}{2}$ .