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Math Help - Slow TI-89 Integration

  1. #1
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    Slow TI-89 Integration

    I have a TI-89 Titanium which I love, but it takes forever to find the definite integrals to certain problems. And by forever, I literally mean 10+ minutes.

    It generally occurs when I'm calculating things like the surface area of a curve rotated around an axis. When I take a definite integral with the square root of trigonometric functions, I tend to have problems.

    Any tips? Or am I just screwed?
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  2. #2
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    I don't know how your memory is, so you could start there and get rid of anything saved. Of course, if you have saved numbers that you want to keep, then you shouldn't do this.
    2nd--> 6 (mem) -->F1--> 1 (Ram)--> 2(Default)

    I've also read that putting the function as parametric function works.
    You put your function in the y value and t in the x value.

    Other than that, I don't know.
    Last edited by mr fantastic; May 5th 2009 at 08:25 PM.
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  3. #3
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    Quote Originally Posted by zyrobinson92 View Post
    I have a TI-89 Titanium which I love, but it takes forever to find the definite integrals to certain problems. And by forever, I literally mean 10+ minutes.

    It generally occurs when I'm calculating things like the surface area of a curve rotated around an axis. When I take a definite integral with the square root of trigonometric functions, I tend to have problems.

    Any tips? Or am I just screwed?
    Try using

    B: nInt

    in the F3 Calc menu.
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