Vector Algebra

Two vectors \(\overrightarrow X\) and \(\overrightarrow Y\) have equal magnitude. The magnitude of (\(\overrightarrow X\) \(-\) \(\overrightarrow Y\)) is n times the magnitude of (\(\overrightarrow X\) + \(\overrightarrow Y\)). The angle between \(\overrightarrow X\) and \(\overrightarrow Y\) is :