I was having an issue with transferring a data value from the [Graph] app of intersecting curves to the [Home] app on the TI-89 Titanium.

Previously on my TI-83 Plus would accomplish this task seamlessly.

Example:

Y1= 1+sec(x)

Y2= 3

[2nd] [Calc] [5] [First Curve] [Second Curve] [Guess]

Intersection: X=-1.049198

[2nd] [Quit] [2nd] [ANS]

Output: -1.049198

Currently on my TI-89 Titanium:

Y1= 1+sec(x)

Y2= 3

[F5][5][First Curve][Second Curve][Lower Bound][Upper Bound]

Intersection: X=-1.0472

Here is where I am lost. Doing [Home] [2nd] [ANS] yields "Error: invalid ans()"

I would like to get ANY point off a graph and compute it to an exact fraction if possible.

In this case, I know that the intersection (Approx -1.0472) is exactly (-pi/3) and would like to easily see this.

So if I get the output 55.7633, I would hope to actually get 71pi/4 and not the decimal approximation. I don't want to receive the approx while not realizing there is an exact form for it.

Additionally, using exact(-1.0472) does not yield the pi fraction (I realize that the number is irrational and I used an approx, so that's why it gives me a huge decimal)

So how would I go about

1- Getting data to transfer from graph to home.

2- Getting exact pi fractions from the approximations my calculator gives me.

Thank you for reading this overly long question on a basic problem.