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Question

The range of f(x)=4sin1+x+x2 is

A
[4,4]
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B
[0,12]
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C
[0,4]
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D
[0,14]
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Solution

The correct option is C [4,4]
sin is defined for all x as 1+x+x2>0
f(x) lies between [4,4] as sinx[1,1]

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