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Question

f(x)=x+sinx is decreasing when x lies in the interval

A
[1,1]
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B
[2,3]
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C
[3,4]
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D
No value of x
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Solution

The correct option is A No value of x
given f(x) is decreasing
so f(x)>0
1+cosx<0
cosx>0
not true for any value of x

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