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Đồ thị màu vàng ở đây là của hàm số y bằng f của x

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Còn đồ thị màu hồng nhạt là của

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hàm số y bằng đạo hàm của f,

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hay f phẩy của x.

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Và đồ thị màu xanh ở đây là của

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hàm số y bằng đạo hàm lần 2 của hàm số ban đầu.

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Hay là đạo hàm của cái này,

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của đạo hàm bậc 1 ở ngay đây.

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Chúng ta đã thấy các ví dụ

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về xác định các điểm cực tiểu và cực đại.

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Rõ ràng là nếu có đồ thị cho trước

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sẽ rất dễ dàng để não ta xác định được

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đây là 1 điểm cực đại.

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