I’m trying to take the derivative of a function and have my answer spit back to me in pretty print. This isn’t working, and I even change the mode on the calculator to pretty print and it doesn’t help.

So, i.e., if I want to take the derivative of d(x^2,x) I know I should get 2x as my answer in pretty print, but its giving me 548.49 instead…

what exactly is pretty print? i’ve extensively used my 89 and i’m not familiar with the term. but yeah it does sound as if you have x set to some value. try using a different variable.

Damn that sounds handy. How well does it do implicit differention?
Im taking Calculus 1 at the moment and I’ve been using EasyCalc for PalmOS on my Treo phone to check my stuff. Prof. recommended either a TI-89 or TI-92. Anyone got any reccommendations for one over the other? I’m looking for a calculator that will last me the entire college career, and as an engineer, I will ALWAYS be taking math.

I thought it might have been something like that. I think on TI-86, if you trace a graph, it will actually sub in the values of the point of your trace into your x-var and y-var.

At that level, you could get a TI-92. (you can just type stuff in on the keyboard) the TI-89 doesn’t have a keyboard, but otherwise it’s pretty much the same thing. I use 89 because it’s legal on more tests and competitions.

Implicit differentiation is another thing you can use… if I remember correctly, its something like: impdif(equation, independent, dependent).

If you don’t want to clear all your variables, you can use “delvar x” to delete stuff. Obviously that one deletes x. F4->4

The only thing I don’t like about the TI89 is that the cost for the TI89, i could pick up a modern handheld gaming system that could run circles around the TI89 computationally. ;(

Whenever I think of my 89 I think this: Know in Final Fantasy after you beat a boss and you get some uber overpowered item and the classic final fantasy music start to play? That’s how I felt when I got my 89. Its as if i’m in some super dark cave, then all of a sudden I pull out my 89 and its bright as day! It is seriously that good!

Besides, me and my 89 go way back. I would never have passed Calc 3 without it. It also helped me a lot in Linear Algebra to do matrix equations.

Go with the Classic Ti-89 over the Ti-92. The 92 is huge and wouldt probably land you in trouble if your taking an exam. The 89 is more compact and similar to other Ti calculators such as the -83 variants.