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Question

If x is positive, the values of f(x)=3cos3+x+x2 lies in the interval

A
[1,3]
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B
[3,3]
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C
[0,3]
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D
[3,0]
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Solution

The correct option is B [3,3]
f(x)=3cos3+x+x2
Since 1cosθ1
So 3f(x)3

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