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Thread: Im I wrong or is the answer not available

  1. #1
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    Im I wrong or is the answer not available

    Iv tried multiple times and I cant get an answer that is listed. What gives?
    Im I wrong or is the answer not available-math.png
    Im I wrong or is the answer not available-scan0001.jpg
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  2. #2
    Forum Admin topsquark's Avatar
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    Re: Im I wrong or is the answer not available

    Quote Originally Posted by thatsmessedup View Post
    Iv tried multiple times and I cant get an answer that is listed. What gives?
    Click image for larger version. 

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    Click image for larger version. 

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    Your work looks good to me. What is the answer supposed to be?

    -Dan
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  3. #3
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    Re: Im I wrong or is the answer not available

    typo ... should be $\displaystyle \cos{\theta} = -\frac{7}{25}$

    use that and the correct solution is there.
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  4. #4
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    Re: Im I wrong or is the answer not available

    You would not imagine how many extra hours iv spent trying to solve typos! arrrrggggg.
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  5. #5
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    Re: Im I wrong or is the answer not available

    I did the problem using the formulas for sin(2x) and cos(2x) and did not get any of the listed answers.
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  6. #6
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    Re: Im I wrong or is the answer not available

    correcting the typo ...

    $\displaystyle \cos{t} = -\frac{7}{25}$ , $\displaystyle \sin{t} = \frac{24}{25}$

    $\displaystyle \tan(2t) = \frac{\sin(2t)}{\cos(2t)} = \frac{2\sin{t}\cos{t}}{2\cos^2{t} - 1}$

    sub in the values for sine and cosine yields

    $\displaystyle \tan(2t) = \frac{336}{527}$
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