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y=cosx單調遞增區間是[2kπ-π,2kπ+π] 對應項 2kπ-π≤π/3—x/2≤2kπ+π 2kπ-4/3π≤-x/2≤2kπ+2/3π 2kπ-4/3π≤x≤2kπ+8/3π 單調增區間{2kπ-4/3π,2kπ+8/3π}
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