Let \( z_{1}, z_{2}, z_{3} \) be three points on \( |z|=1 \) Let \( \theta_{1} \theta_{2} \), an...
Let \( z_{1}, z_{2}, z_{3} \) be three points on \( |z|=1 \) Let \( \theta_{1} \theta_{2} \), and \( \theta_{3} \) be the argumets of \( z_{1}, z_{2}, z_{3} \) then \( \cos \left(\theta_{1}-\theta_{2}\right)+\cos \left(\theta_{2}-\theta_{3}\right)+ \) \( \cos \left(\theta_{3}-\theta_{1}\right) \)
(a) \( \geq-\frac{3}{2} \)
(b) \( \leq-\frac{3}{2} \)
(c) \( \geq \frac{3}{2} \)
(d) \( \frac{3}{2} \)
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