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January 20th, 2019, 02:04 AM  #1 
Newbie Joined: Jan 2019 From: Europe Posts: 3 Thanks: 0  Prove of an inequation with absolute values
Hello, how can I prove that if 3f(x)=2x+sin(f(x)) for all x€R, then f(x)<=x for all x€R? 
January 20th, 2019, 04:02 AM  #2 
Senior Member Joined: Dec 2015 From: somewhere Posts: 600 Thanks: 88 
Hint: $\displaystyle \sin f(x) \leq f(x)$ .


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absolute, inequation, prove, values 
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