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Math Help - Analytic Trig

  1. #1
    Member purplec16's Avatar
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    Analytic Trig

    Find the exact value of sin 2\theta, cos 2\theta, and tan 2\theta for the given values of \theta

    sec\theta = -3 ;  \frac{\pi}{2} is greater than \theta or less than \pi

    Can someone show me how you solve this
    Last edited by purplec16; March 16th 2010 at 07:17 PM. Reason: Sorry left out the question
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  2. #2
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    sec(x) = 1/cos(x) so essentially you're looking for arccos(-1/3) as 1/(-1/3)=-3

    I'm quite certain you've mistranslated the question as I don't know exactly what bounds it is looking for but there is no value of theta between 0 and pi/2 that will give you that answer.
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  3. #3
    Member purplec16's Avatar
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    sorry i left out the question part :S
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