Results 1 to 4 of 4

Math Help - solve a trig problem

  1. #1
    Junior Member
    Joined
    Sep 2009
    Posts
    74

    solve a trig problem

    Can someone point me in the right direction on how to solve this problem?

    2sinx - sin2x = \frac{4}{\pi}

    I need to solve for x. I'm honestly not even sure where to begin. I could use double angle identities to turn sin2x into 2sinxcosx, which would then let me turn it into

    2sinx(1-cosx) = \frac{4}{\pi}

    But I'm not sure how (or if) that would actually help me. Thanks in advance.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor Siron's Avatar
    Joined
    Jul 2011
    From
    Norway
    Posts
    1,250
    Thanks
    20

    Re: solve a trig problem

    Do you have to solve this exactly?
    I gues using a calculator can be very useful, graph the two functions and look at the intersection points.
    (Take a look @ wolphram alpha for example, the solution isn't easy)
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    Sep 2009
    Posts
    74

    Re: solve a trig problem

    Oh, ok. Yes, I was trying to solve it exactly. This is actually part of a problem for Calculus 2 (mean value theorem for integrals) that ended up with trying to solve that particular problem to get the two intersection points for f(ave). I was tracking fine with the solution up to that point, but I have no idea where the book pulled the final answer from. I thought it was just my admittedly weak trig skills that were lacking. The book answer did give an approximate answer, so maybe I was just expected to graph it and guesstimate.

    I did check out Wolphram (first time user, woo) and the solution look a bit beyond my current math level. Thanks for the post.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor Siron's Avatar
    Joined
    Jul 2011
    From
    Norway
    Posts
    1,250
    Thanks
    20

    Re: solve a trig problem

    Yes, indeed! The solution is complicated and I don't think it can be solved analytically.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. How do i solve this trig problem - Polar equations.
    Posted in the Pre-Calculus Forum
    Replies: 4
    Last Post: January 12th 2011, 07:17 PM
  2. A Quick Trig Identity Problem That I Need To Solve
    Posted in the Advanced Applied Math Forum
    Replies: 8
    Last Post: March 29th 2010, 11:37 PM
  3. How do you solve this bearing trig problem?
    Posted in the Trigonometry Forum
    Replies: 4
    Last Post: May 17th 2009, 02:26 AM
  4. How to solve this trig problem..
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: April 2nd 2009, 07:24 AM
  5. Anyone know how to solve this trig problem?
    Posted in the Trigonometry Forum
    Replies: 2
    Last Post: April 17th 2007, 10:26 PM

Search Tags


/mathhelpforum @mathhelpforum