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!

Rearranging Trigonometric Functions

  1. Feb 4, 2014 #1
    This is my very first post - so i hope I don't break any rules - its more of a formula rearranging question/confirmation so here goes...

    1. The problem statement, all variables and given/known data
    Currently working on friction - static/kinetic - so in my text book it states in a side bar "info bit" that

    tanθ=sinθ/cosθ my question is : can this equation be rearranged - see below...

    2. Relevant equations

    so if tanθ=sinθ/cosθ then does sinθ=(tanθ)(cosθ) and does cosθ=sinθ/tanθ

    3. The attempt at a solution

    I haven't come across any questions so far where i would need to use sinθ=(tanθ)(cosθ) and cosθ=sinθ/tanθ - more or less a general question of would I encounter having to use the sinθ=(tanθ)(cosθ) and cosθ=sinθ/tanθ rather than tanθ=sinθ/cosθ - numerically it works, but are these variations used?

    Hope this wasn't clear as mud... If i can provide any more info - let me know!

  2. jcsd
  3. Feb 4, 2014 #2


    User Avatar
    Homework Helper
    Gold Member

    Hello talknerdy2me,

    Welcome to Physics Forums! :smile:


    Yep. You got it. :smile:

    If it helps, this might make it a little more easy to remember:

    [tex] \sin \theta = \frac{\text{opposite}}{\text{hypotenuse}} [/tex]
    [tex] \cos \theta = \frac{\text{adjacent}}{\text{hypotenuse}} [/tex]
    [tex] \tan \theta = \frac{\text{opposite}}{\text{adjacent}} [/tex]
    If you can remember those, the other relationships you mentioned above should fall into place.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted

Similar Threads - Rearranging Trigonometric Functions Date
Rearranging Formulas: Fairly simple but I'm very stuck Nov 15, 2017
Rearraging equation Nov 7, 2017
Equation Rearrangement problem(I think) May 14, 2017