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Posted by on Monday, November 17, 2008 at 9:36pm.

cos2x(2cosx+1)=0

Solve for x.

  • Trig - , Monday, November 17, 2008 at 9:51pm

    Please.

  • Trig - , Monday, November 17, 2008 at 10:10pm

    (2cos^2x-1)(2cosx+1)=0
    ^
    [Double angle identity]

    Now I'm stuck.

  • Trig - , Saturday, October 12, 2013 at 11:14am

    hey ted did you ever figure that out because if so tell me tell me now plz i need this very much

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