Thus, the value of $ b $ is $ \boxed3 $.Question: In a palynological study, three pollen grain counts are modeled by vectors $\vecA, \vecB, \vecC$, each of unit magnitude. If the total angular deviation between each pair satisfies $\cos^-1(\vecA \cdot \vecB) + \cos^-1(\vecB \cdot \vec - go-checkin.com