A virologist researching antiviral therapies models viral load dynamics with the function \( V(t) = V_0 \cos^2(\omega t + \phi) \), where \( V_0 \) is the maximum viral load, \( \omega \) is the angular frequency, and \( \phi \) is the phase shift. If \( V(0) = \fracV_02 \) and \( V\left(\frac\pi2\omega\right) = 0 \), find \( \phi \). - Groen Casting