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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- Apr 13th 2008, 05:13 PMsmpleaseERROR: 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 - Apr 13th 2008, 05:52 PMangel.white
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*) - Apr 13th 2008, 10:11 PMearboth
- Apr 13th 2008, 10:39 PMmr fantastic
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( - Apr 13th 2008, 10:41 PMmr fantastic
- Apr 13th 2008, 10:45 PMearboth
- Apr 25th 2008, 10:23 AMmamajen
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 - Jan 4th 2010, 06:22 PMbranperasame problem
When ever I try and enter 2nd sin (sin-1) and cos (cos-1). it comes up with the domain error.(Angry)

- Jan 4th 2010, 06:30 PMmr fantastic
1. You have to provide input: $\displaystyle \sin (\sin^{-1} (x))$.

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

What type of calculator do you have and what**exactly**are you typing into it? - Jan 4th 2010, 06:46 PMbranpera
ok i was putting in a number bigger than 1. What is sin-1 used for.

- Jan 4th 2010, 06:59 PMskeeter