NDA Math Application of Derivatives

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Directions (Q. Nos. 89 and 90): Read the following information and answer the two items that follow:
Consider the function f(x)=3x4–20x3–12x2+288x+1
[NDA II 2019]
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Question : 29 of 73
 
Marks: +1, -0
In which of the following intervals is the function increasing ?
[NDA II 2019]
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