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Thread: dbl int and desmos graoh

  1. #1
    Super Member bigwave's Avatar
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    dbl int and desmos graoh

    $\tiny{15.3.53}\\
    \displaystyle
    \int_{0}^{\frac{\pi}{6}}
    \int_{0}^{\sec{\theta}}
    6r^{3} drd\theta$

    just want to see if this desmos graph is correct
    wanted to shade the wedge area but ???
    also got $0.96225$ for calulated answer but they wanted exact

    dbl int and desmos graoh-capture-_2017-09-10-16-11-06.png
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  2. #2
    MHF Contributor

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    Re: dbl int and desmos graoh

    It looks to me like you have the graph of r= \pi/6, the circle, in polar coordinates but the graph of r= sec(\theta) (NOT x= sec(y)) in Cartesian coordinates.
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  3. #3
    Super Member bigwave's Avatar
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    Re: dbl int and desmos graoh

    \textsf{ok the selection of graphs looks like an angle of $\displaystyle\frac{\pi}{6}$ intersecting $\sec{\theta}$ ?}\\
    \textsf{$r=\sec \left(\theta \right)$ is a vertical straight line at $x=1$}
    \textsf{in other words I lost!!!}
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  4. #4
    Super Member bigwave's Avatar
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    Re: dbl int and desmos graoh

    ok the selection of graphs looks like an angle of
    \displaystyle\frac{\pi}{6} intersecting  r=\sec{\theta}
    is a vertical straight line at
    x=1
    Last edited by bigwave; Sep 11th 2017 at 06:20 PM. Reason: latex
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