1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Simple Hyperbolic Functions

  1. May 30, 2007 #1
    Cosh u = (2sinh u) -1

    Working from definitions

    http://img118.imageshack.us/img118/3271/eusm4.png [Broken]

    Its a worked example from the book, which isnt very well explained. The only step i struggle on is from how the managed to get all the u's positive (step 2). I plugged some numbers in for u and find the two equations dont equal each other anyway. What am i doing wrong?

    Last edited by a moderator: May 2, 2017
  2. jcsd
  3. May 30, 2007 #2

    George Jones

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    What happens when you multiply the second equation in your linked image by e^u?

    Right, this equation isn't satisfied by all values of u. You are supposed to find the values of u for which it is satisfied.
  4. May 30, 2007 #3
    gotcha thx!
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook