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प्रश्न
Let f(x) = x3 − 6x2 + 9𝑥 + 18, then f(x) is strictly decreasing in ______
विकल्प
(−∞, 1)
(3, ∞)
(−∞, 1) ∪ (3, ∞)
(1, 3)
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उत्तर
(1, 3)
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