UPSC NDA II 2018 Mathematics Solved Paper

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Question : 78 of 120

Marks: +1, -0

Which one of the following is correct in respect of the function f(x)=x‌sinx+cosx+‌‌

1

2

cos2x ?

[NDA II 2018]

It is increasing in the interval (0,
π
2
)
It remain constant in the interval (0,
π
2
)
It is decreasing in the interval (0,
π
2
)
It is decreasing in the interval (
π
4
,
π
2
)

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