evaluate. write your answer in simplified, rationalized form. do not round. cos 60° =

Explanation:

Step1: Recall cosine value

We know from the unit - circle or special - right - triangle relationships that for an angle of 60 degrees in a 30 - 60 - 90 triangle, if the hypotenuse $c = 2$, the adjacent side $a = 1$ to the 60 - degree angle. The cosine of an angle $\theta$ in a right triangle is defined as $\cos\theta=\frac{\text{adjacent}}{\text{hypotenuse}}$. $\cos60^{\circ}=\frac{1}{2}$

Answer:

$\frac{1}{2}$