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08.07.2021 •
Mathematics
Câu 21: [TMD] Cho hàm số f x( ) có đạo hàm liên tục trên R và có đồ thị hàm số y f x '( ) như hình vẽ bên dưới. Hỏi hàm số f x 2sin 1 nghịch biến trên khoảng nào dưới đây ?
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