Desolve with symbolic constants

[Aleksandr94]

Hallo!
How can I solve differential equations containing constant coefficient? Say I want to solve y"=y/a.
So I tried desolve(y"=y/a,x,y) without success.
So is it possible to do so using this calculator?

[parisse]

Type shift () to get '', instead of "

[bxparks]

(07-23-2024 04:28 PM)parisse Wrote:  Type shift () to get '', instead of "

Which confused me for several seconds, because they looked almost identical in my font. If you missed it, the first is two single-quote characters (not including the comma character), and the second is the double-quote character.

[Aleksandr94]

I did it. It didn't help.

[C.Ret]

Don't despair, try harder.
I mean with the correct secret keystrokes:

[Aleksandr94]

(07-23-2024 07:35 PM)C.Ret Wrote:  Don't despair, try harder.
I mean with the correct secret keystrokes:

I tried it. It didn't help. I recieved [] as answer.

[Gene222]

Check to see if a user variable "a" was created. On the CAS screen, press the Vars key, tap the User tab, then tap User Variables. A list of user variables will appear. If there is a variable a, use the arrors keys to highlight the variable, and the press the backspace or correction key to delete the variable.

This might make desolve(y''=y/a,x,y) work on the CAS screen. As previously stated, use single quotes. As near as I can tell for your problem, there should not be any cas or user variables for x,y, or a.

[parisse]

Run the restart() command, this will insure all CAS variables are cleared.