Results 1 to 2 of 2

Math Help - trigonometry equations help

  1. #1
    Newbie
    Joined
    May 2009
    Posts
    1

    trigonometry equations help

    Solve each equation for x if 0 x 2π give your answers in radians using exact values only.

    sin x = -cos 2x

    I need help
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Junior Member
    Joined
    Jan 2009
    Posts
    32
    Try using the identity cos2x = 1-2sin^2{x}.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. *Trigonometry Equations*
    Posted in the Trigonometry Forum
    Replies: 5
    Last Post: October 22nd 2011, 01:03 PM
  2. Trigonometry Equations? multiples of pi?
    Posted in the Trigonometry Forum
    Replies: 3
    Last Post: November 28th 2010, 04:41 PM
  3. Trigonometry Equations Question
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: October 6th 2010, 02:57 AM
  4. Differentiation of trigonometry equations
    Posted in the Calculus Forum
    Replies: 5
    Last Post: June 27th 2009, 02:49 PM
  5. Rearranging Equations and Trigonometry
    Posted in the Pre-Calculus Forum
    Replies: 4
    Last Post: June 24th 2009, 05:57 PM

Search Tags


/mathhelpforum @mathhelpforum