Best method to solve very slightly advanced equations.

[NewMC]

Hi all, thanks for the quick responses and suggestions.

Let me clarify that I have tried X, x, A, and Greek A (shift, 9, down, enter) all as variables and I either get a bad argument error or the same answer of 2.398 (using Solve). If I put this equation into CAS without any commands it gives 6.928e^-13. solve(), csolve(), and fsolve() with the equation set equal to zero within the brackets all give an output of [[]] (can anyone tell me what this means).

In the Function app/Plot/Fcn/Root gives 0.322 for the root. This morning I reset both A and X within the user variables in memory manager but that did no good.

There have been times in the past where I thought there was something wrong with my calculator, but wiping the memory and installing updated firmware at that time did not improve the outcomes I was getting.

Basically, I really need a calculator solution for solving by iteration, it's a bit cumbersome on the TI-83+ and I hate to keep going back to my twenty y/o calc. for things that should be a breeze on the Prime.

Thanks!

Edit: I did manually push the reset button this morning (which as far as I know will basically do a full restart on the calculator) but got the same results.

Using the virtual calculator when I put this equation in the Function app it shows the roots to be 0. In the advanced graphing app/Trace/POI/X-intercepts is gives 1.986652 but with the same steps on the actual calculator it is still giving me the 2.398 result.

And working through this again I believe that [[]] was telling me that I was not using the function correctly. I also realized that my angles were in degrees instead of radians...so my apologies for wasting everyone's time for a wrong setting on my part. Thanks for your help, I'm now getting the correct result in Solve, Function, Advanced Graphing, and CAS.