Results 1 to 3 of 3

Math Help - two trigo problems again

  1. #1
    Member
    Joined
    Sep 2007
    Posts
    176

    two trigo problems again

    p.200 q15
    two trigo problems again-out0087.jpeg
    two trigo problems again-out0085.jpeg
    two trigo problems again-out0086.jpeg
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Eater of Worlds
    galactus's Avatar
    Joined
    Jul 2006
    From
    Chaneysville, PA
    Posts
    3,001
    Thanks
    1
    #1: I will just use x instead of theta for sake of typing.

    2cos(3x)sin(x/2)=sin(7x/2)-sin(5x/2)

    2cos(2x)sin(x/2)=sin(5x/2)-sin(3x/2)

    2cos(x)sin(x/2)=sin(3x/2)-sin(x/2)

    See the pattern?.

    Put it together.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Member
    Joined
    Sep 2007
    Posts
    176
    sorry i knew how to do it and that is not the question i asked. was my hand writing so bad?
    question 1 : was my expression correct?
    question 2 : is trial and error the only way to get the correct value of n?
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Trigo Equations/Identities Problems
    Posted in the Trigonometry Forum
    Replies: 9
    Last Post: November 30th 2009, 07:23 PM
  2. Difficult Trigo Problems
    Posted in the Trigonometry Forum
    Replies: 2
    Last Post: September 9th 2009, 05:43 AM
  3. trigo
    Posted in the Trigonometry Forum
    Replies: 3
    Last Post: September 9th 2009, 02:49 AM
  4. trigo (5)
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: August 14th 2009, 06:03 AM
  5. three trigo problems
    Posted in the Trigonometry Forum
    Replies: 3
    Last Post: January 28th 2008, 12:13 AM

Search Tags


/mathhelpforum @mathhelpforum