Strictly Decreasing Cubic Function (Jee Mains) | ExamDuo
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Application of Derivates
Medium
Strictly Decreasing Cubic Function
Let f (x) = x³ – 6x² + 9x + 18 , then f (x) is strictly decreasing in :
SELECT ONE OPTION
A
(1 , 3)
B
[-∞ , 1] ∪ [3 ,∞]
C
[3 ,∞]
D
[-∞ , 1]
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