What is wrong with my calculator? invNorm Error:Domain

The inverse cosine function is defined for arguments from -1 to +1. 6 is outside of this domain, thus the error. Do you get an error if you try the inverse cosine of 0.6, for example?

If you're getting the same error for the inverse tangent, could you post an example?

The arccosine function is defined for arguments in the range from -1 to +1. 50/30 is greater than 1 and thus is out of the domain.

The sine and cosine function have a range between [-1, 1]. The domain of their inverse functions is [-1,1]. So 20/1 which is 20 is out of the domain of definition of the functions. No limitations for tangent and cotangent.

It depends on the function. The domain is the set of values that are permitted as input to the function. For the square root for example you cannot calculate square root of a negative number. If you type in sqrt(-3) you get a domain error.

If you are calculating inverse trigonometric functions such as arc sine and arc cosine the argument of the function must be in the closed interval [-1,1].

The range of the cosine and sine functions is limited to the interval [-1, 1]. As a result the calculator will send an error message if the functions are called with arguments outside the interval [-1, 1]. Aside from this, I do not see any reason why the functions would give an error.

What were you doing when that error occurred? No, i am not asking for your alibi. It helps to narrow down the possibilities. Anyway, I think you might have asked the calculator to calculate a function at a value for which it (the function) is not defined. An example is the arc cosine or arc sine. They are defined on the closed interval [-1,1]. If you ask the calculator to evaluate cos^-1(3.45) you will get a domain error because the argument 3.45 is not within the domain [-1,1] of the arc cosine function.

You cannot, for the simple reason that the domain of the arc sine function is restricted to the closed interval -1 to 1. Since you want to feed the value 1.3 to that function, it will reject it and you will get a domain error,
If you are trying to calculate the arc sine for your own enjoyment, restrict the values to the interval -1 to 1. If you are attempting to solve a problem, you may want to check the wording of the problem or the data or any intermediate calculations you may have performed.

That is correct: there is an error in your request. The range of the sine function spans the closed interval [-1, 1]. Thus the domain of the inverse sine function (the arc-sine) is the interval [-1,1]. However you are asking the calculator to calculate outside of the domain (7/2=3.5). If you are using the hyperbolic sine sinh, that is another matter.

Not enough info. ex: ans(100) is a domain error b/c 1-99.
email [email protected] for additional help. Could be a lot of reasons. I be glad to work through problem w/ you.

Not sure if TI-89 mode keys are the same, but here's the solution for that calculator:
1. Hit the mode key
2. Hit F3 to get tot Exact/Approx (might be different for 89T).
3. Set it to Exact.
4. Take a look at T-89 manual pages 327, 328, 329.
Nice of TI to NOT include that in the manual, huh?