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-   -   Trigonometry (https://www.askmehelpdesk.com/showthread.php?t=333153)

  • Mar 24, 2009, 05:23 AM
    wazhma1991
    Trigonometry
    Hi galactus how shoud I solve this :confused:

    sin^2 20=cos^2 20-cos^2 40
  • Mar 24, 2009, 08:47 AM
    galactus
    Are you solving it or proving they are the same?
  • Mar 25, 2009, 05:57 AM
    wazhma1991

    Hi I want to solved I know that is right but how?
  • Mar 25, 2009, 07:07 AM
    galactus


    That is not an identity. They are not equivalent.

    That's what leads me to believe you were asked to solve for theta perhaps.

    But, to solve the equation, notice the identity

    Therefore,

    Another identity:



    Try

    Play around with various identities until you can whittle it down enough to solve for x.

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