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### #1 grob103

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Posted 06 January 2020 - 09:41 PM

Hi!

I am researching to get a 991EX and wondering if it can do something like this:

value1 = sin A + sin B + sin C

value2 = cos A + cos B + cos C

I want to store the variables A, B and C and then run the two formulas to get value1 and value2. Then I get another set of A, B and C and run both formulas again to get the results. What is important is: I turn off the calculator and turn it back on, I still have the two formulas available to me and I can run immediately.

Also, I need to run those two in DEG mode. Can I input degrees like 20 degrees 17.4 minutes (note the minutes are not integer but a real number).

Thanks!

grob103

Edited by grob103, 06 January 2020 - 09:46 PM.

### #2 Hlib2

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Posted 07 January 2020 - 11:22 AM

1) 991EX allows you to manipulate with formulas and numbers in Spreadsheet mode by a total size of no more than 1700 bytes. When you turn off the calculator or change the operating mode, all data is erased (except for numeric cells A, B,...F,M). One can delay this process by setting the calculator`s auto-off time to 60 minutes.
2) You can input degrees in the form like 20°17.4°, but the result is returned as a 20°17`24" or 20.29(degrees), not a 20°17.4`.

### #3 grob103

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Posted 07 January 2020 - 02:33 PM

Thank you for your answer, Hlib2! The #2 above is exactly what I want--I just need to input real number for minutes part and it's fine calculator converts first into seconds. But #1 seems to be a show stopper. I may have to go with a Sharp such as EL-506T which can save 4 formulas although I have not try it myself to see if it works (there is no Sharp forum it seems). Otherwise I have to go with a more expensive Casio programmable model like 3650P just to save formulas. Casio needs to do better on this.   However Casio has better build quality which I like....

### #4 Tritonio

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Posted 08 January 2020 - 01:23 AM

1) One can delay this process by setting the calculator`s auto-off time to 60 minutes.

Wait... you can change that? I've never seen this option!

### #5 Hlib2

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fx-9750GII, fx-991DE_X,
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Posted 08 January 2020 - 06:03 PM

I was mistaken, the 60 minutes auto-off function is in the German version.

Edited by Hlib2, 08 January 2020 - 06:20 PM.

### #6 Tritonio

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Posted 09 January 2020 - 12:29 AM

It's really annoying that there is no english version with all the extra functionality. The english EX is actually missing functions that existed in the ES series... And the features exist in all the other language editions of the EX. It's missing basic stuff like LCM GCD. You can still do them using the prime decomposition function but you need to write something down on a paper to do it. The 60 minute timeout is also very useful as it has shutdown on me causing me to lose a couple of numbers.

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