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Math Help - ERROR: DOMAIN ..when doing sec and cosec..

  1. #1
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    ERROR: DOMAIN ..when doing sec and cosec..

    Hey I'm so confused, my TI-83 Plus started to give me ERR: DOMAIN today when ever I put a sec or cosec in that isn't equal to 0 or 1. It only just started doing this and I haven't touched anything or changed anything whats going on?

    Thanks
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  2. #2
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    Quote Originally Posted by smplease View Post
    Hey I'm so confused, my TI-83 Plus started to give me ERR: DOMAIN today when ever I put a sec or cosec in that isn't equal to 0 or 1. It only just started doing this and I haven't touched anything or changed anything whats going on?

    Thanks
    No idea, try resetting. If that doesn't work, you can at least work around it by doing 1/cos(x) and 1/sin(x)

    A bit of a hassle, sure, but my calculator doesn't even have an option for such functions, it's not too bad. (though not being able to convert decimals to fractions is a pain in the *ahem*)
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  3. #3
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    Quote Originally Posted by smplease View Post
    Hey I'm so confused, my TI-83 Plus started to give me ERR: DOMAIN today when ever I put a sec or cosec in that isn't equal to 0 or 1. It only just started doing this and I haven't touched anything or changed anything whats going on?

    Thanks
    Hello,

    are you sure that you have nowadays a "sec" or "cosec"-key at a TI83?

    My TI84 and TI89 don't have such keys. I checked the catalogues and didn't find this function either.
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  4. #4
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    Quote Originally Posted by earboth View Post
    Hello,

    are you sure that you have nowadays a "sec" or "cosec"-key at a TI83?

    My TI84 and TI89 don't have such keys. I checked the catalogues and didn't find this function either.
    I can't readily check the TI84 but on a TI89 you can get sec( and csc( from the catalogue.

    When accessing the catalogue I find it useful to use the alpha key to scroll to the starting character I want (but you sometimes might need to do it twice) ..... alpha 3 (S) gets you to sec(
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    Quote Originally Posted by smplease View Post
    Hey I'm so confused, my TI-83 Plus started to give me ERR: DOMAIN today when ever I put a sec or cosec in that isn't equal to 0 or 1. It only just started doing this and I haven't touched anything or changed anything whats going on?

    Thanks
    Are you playing games on it. Some games can do funny things to your settings that aren't immediately obvious.
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  6. #6
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    Quote Originally Posted by mr fantastic View Post
    I can't readily check the TI84 but on a TI89 you can get sec( and csc( from the catalogue.

    When accessing the catalogue I find it useful to use the alpha key to scroll to the starting character I want (but you sometimes might need to do it twice) ..... alpha 3 (S) gets you to sec(
    You are right.

    I checked if the function "cosec" was build-in, found nothing, and deduced that then the "sec"-function doesn't exist either.
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  7. #7
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    i have a TI-83 plus and there is no sec or csc built in. It has sin cos and tan. when you use the 2nd button, sin you get sin^-1, cos gives you cos^-1, and tan you get tan^-1

    the only way i have ever been able to enter the sec, csc, and cot is to use the simple formulas
    sec= 1/cos
    csc= 1/sin
    cot= 1/tan
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  8. #8
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    same problem

    When ever I try and enter 2nd sin (sin-1) and cos (cos-1). it comes up with the domain error.
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  9. #9
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    Quote Originally Posted by branpera View Post
    When ever I try and enter 2nd sin (sin-1) and cos (cos-1). it comes up with the domain error.
    1. You have to provide input: \sin (\sin^{-1} (x)).

    2. Unless you choose a value of x that satifisfies -1 \leq x \leq 1 you will probably get a domain error.

    What type of calculator do you have and what exactly are you typing into it?
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  10. #10
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    ok i was putting in a number bigger than 1. What is sin-1 used for.
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  11. #11
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    Quote Originally Posted by branpera View Post
    ok i was putting in a number bigger than 1. What is sin-1 used for.
    \sin^{-1} is the inverse sine function (arcsin) , not the cosecant function.
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