Question

If $2\cos \theta =1$ and $\theta$ is acute angle, then what is $\theta$ equal to?

Answer 1

Given $2\cos \theta =1$ $\therefore \cos \theta =\frac{1}{2}$
We know, $\cos {60}^o=\frac{1}{2}$ $\therefore \cos \theta =\cos {60}^o$ $\therefore \theta ={60}^o$