1. Not finding help here? Sign up for a free 30min 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!

Sin() function problem

  1. Aug 20, 2008 #1
    f(x) = 9 sin 7 x, and g(x) = 18 sin(7 x + 5)

    so, i assume by looking just like this g(x) is twice much more than f(x) and 5 units more, correct??
     
  2. jcsd
  3. Aug 20, 2008 #2
    Re: sin

    What do you mean by twice much more and 5 units more? You need to figure out what each of the factors in f(x) = A*sin(Bx + C) + D does, for example, A is the amplitude, 2pi/B is the period, now think as to what C and D are.
     
  4. Aug 20, 2008 #3
    Re: sin

    Thanks.
     
  5. Aug 20, 2008 #4

    Redbelly98

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    Re: sin

    If you're wondering how much the g(x) is shifted relative to f(x), it's not 5 units. But yes, the amplitude is twice as much.

    To get the shift, rewrite g(x) as

    g(x) = 2f(x-h)

    or

    18 sin (7x - 5) = 2*9 sin(7(x-h))

    What mus h be, to make those expressions equal?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Sin() function problem
  1. Sin function (Replies: 9)

Loading...