Найдите корни уравнений, принадлежащие данному промежутку.
а) cosφ=1, φ∈[-π;5π];
б) cosφ=-[tex] \left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right] \frac{1}{2} [/tex],[0;2π]
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