Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I am not a mathematician and the last time I used a formula complexer than sin(x) was during my university time about 10 years ago.

Recently I saw an interesting graph but I couldn't find its formula or even its name.

here is an almost representation of the graph.

every time the graph descends, it descends to the top of last peak (in y value).

I like to know

  • Is this graph has a name?
  • What is its equation?
share|cite|improve this question
$\sin x + x$ would be close. – Alex Becker Apr 16 '13 at 2:18
@AlexBecker, Thanks for the answer, it is close, but it does not descend to top top of last peak here it is – AaA Apr 16 '13 at 2:21
up vote 2 down vote accepted

I believe this does the trick: $$f(x) = \frac{2}{3 \pi} x + \cos{x}$$

It doesn't have any special names I'm aware of, though.

share|cite|improve this answer
Thanks, this is exactly the answer I was looking for. You mathematicians have an amazing world! Google has a facility to see your graph here is the link – AaA Apr 16 '13 at 2:29

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.