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(1)若導數大於零,則單調遞增,若導數小於零,則單調遞減.導數等於零為函數駐點,不一定為極值點,需代入駐點左右兩邊的數值求導數正負判斷單調性. (2)若已知函數為遞增函數,則導數大於等於零,若已知函數為遞減函數,則導數小於等於零.
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