vanthanh9802

Điểm cố định của họ đồ thị

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Đường tròn lượng giác

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Minh họa khái niệm tích phân

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Minh họa diện tích hình phẳng

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Viết vài bài góp phần nhe :
Bài toán biện luận số nghiệm của phương trình.


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