Results 1 to 3 of 3

Math Help - To solve K

  1. #1
    Newbie
    Joined
    Sep 2012
    From
    Singapore
    Posts
    13

    To solve K

    i was given this qn.... sin(A-B) = k sin(A+B)

    sin(A-B) = sinAcosB + sinBcosA
    = 1/2[sin(A+B)+sin(A-B)] - 1/2[sin(A+B)-sin(A-B)]

    im not sure if im on the right track. cant seem to continue cos i will always return to sin(A-B)

    PLEASE HELP!
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Prove It's Avatar
    Joined
    Aug 2008
    Posts
    11,831
    Thanks
    1602

    Re: To solve K

    Quote Originally Posted by ZGOON View Post
    i was given this qn.... sin(A-B) = k sin(A+B)

    sin(A-B) = sinAcosB + sinBcosA
    = 1/2[sin(A+B)+sin(A-B)] - 1/2[sin(A+B)-sin(A-B)]

    im not sure if im on the right track. cant seem to continue cos i will always return to sin(A-B)

    PLEASE HELP!
    What are you actually trying to do with this question?

    Edit: Didn't read the title. Just divide both sides by \begin{align*} \sin{\left( A + B \right)} \end{align*}.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Sep 2012
    From
    Singapore
    Posts
    13

    Re: To solve K

    cos i need to prove that sin(A-B) = k sin(A+B)


    then from there i need to prove


    tanA = [(1+k)/(1-k)] tanB
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Solve for x
    Posted in the Algebra Forum
    Replies: 4
    Last Post: January 31st 2011, 09:49 PM
  2. need to solve summation equation to solve sum(x2)
    Posted in the Statistics Forum
    Replies: 2
    Last Post: July 16th 2010, 11:29 PM
  3. Replies: 1
    Last Post: June 9th 2009, 11:37 PM
  4. solve for x...
    Posted in the Algebra Forum
    Replies: 2
    Last Post: January 30th 2009, 11:50 PM
  5. Solve: x^5 - x = 0
    Posted in the Algebra Forum
    Replies: 2
    Last Post: January 26th 2009, 08:34 PM

Search Tags


/mathhelpforum @mathhelpforum