Через какое время от начала колебания точка, которая выполняет колебательное движение по уравнению x=7sinπ/2t, проходит путь от положения равновесия до максимального смещения ?

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The weather was nice. Nature was wonderful there. There were a mountain river there.One day we were in the mountains. The air was fresh. The water in the river was clean. We was happy.