arccos 1/2

The value of \( \arccos\left(\frac{1}{2}\right) \) is \( \frac{\pi}{3} \) radians (or \( 60^\circ \)). This is because cosine of \( 60^\circ \) (or \( \frac{\pi}{3} \) radians) equals \( \frac{1}{2} \).