Results 1 to 3 of 3

Math Help - Trigo qn

  1. #1
    Member maybeline9216's Avatar
    Joined
    Sep 2008
    From
    Singapore~
    Posts
    108

    Trigo qn

    Please do the last part of the qn "By using the relation sin2x=cos(90-2x), find one of these solutions by calculation."
    Attached Thumbnails Attached Thumbnails Trigo qn-benqn2.jpg  
    Follow Math Help Forum on Facebook and Google+

  2. #2
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Quote Originally Posted by maybeline9216 View Post
    Please do the last part of the qn "By using the relation sin2x=cos(90-2x), find one of these solutions by calculation."
    we have \sin 2x = \cos 3x

    then we are told \sin 2x = \cos(90 - 2x)

    this means that \cos (90 - 2x) = \cos 3x

    \Rightarrow 90 - 2x = 3x

    now continue
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Member maybeline9216's Avatar
    Joined
    Sep 2008
    From
    Singapore~
    Posts
    108
    O.o so easy arh?? thanks
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Trigo Eqn
    Posted in the Trigonometry Forum
    Replies: 7
    Last Post: December 2nd 2009, 03:53 AM
  2. Trigo qn
    Posted in the Trigonometry Forum
    Replies: 4
    Last Post: October 8th 2008, 05:13 AM
  3. Trigo qn
    Posted in the Trigonometry Forum
    Replies: 2
    Last Post: October 7th 2008, 05:39 AM
  4. trigo sum/different~do not do~!
    Posted in the Trigonometry Forum
    Replies: 5
    Last Post: September 11th 2008, 07:43 AM
  5. trigo > i cant do it!
    Posted in the Trigonometry Forum
    Replies: 3
    Last Post: September 9th 2008, 06:43 AM

Search Tags


/mathhelpforum @mathhelpforum