A) Always increasing
B) Always decreasing
C) Increasing for certain range of x
D) None of these
Correct Answer: A
Solution :
\[f(x)=x+\cos x\] Þ \[{f}'(x)=1-\sin x\] \[{f}'(x)>0\] for all values of x. \ \[f(x)\] is always increasing.
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