I'm using the fx-cg50 and doing problems regarding polar graphs. I have my variables in terms of theta but I cannot figure out how to do d(theta) instead of dx when you hit options and clac in the graph mode. I would really appreciate help from some who know how to change it.

Problem with differentiation with respect to theta
#1
Posted 26 March 2022 - 02:05 PM
#2
Posted 26 March 2022 - 02:20 PM
As far as I would understand:
You are in Graph Mode (Menu -> 5).
You are using r = <term>.
You want to use differential/integration in OPTN -> Calc Menu.
In the casio docs for differential/integration (Go to SHIFT -> 4 Catalog -> <your command> -> QR) it is stated that you can only use "X" as the variable. That cannot be changed.
What's the problem? just use X instead in your formula.
The Graph editor uses an X/x if you have Y = <term> and (theta) for r = <term>.
The differential uses X/x for calculation.
Edited by HappyCalc, 26 March 2022 - 02:22 PM.
#3
Posted 26 March 2022 - 02:53 PM
https://www-fourier....nstall_en#casio
There you can use
diff(<term>,<var>) for differential,
plot(<term>,<var>) to show a y= graph and
plotpolar(<term>,<var>) to show a r= graph.
For example try this:
r:=sin(2*theta)
rd:=diff(r,theta)
plotpolar(rd,theta)
That would draw cosine wave in polar coordinates. You can change the variables to whatever you want. You can also name them foo, bar, baz...
#4
Posted 26 March 2022 - 03:43 PM
here's the equation I was trying to enter into my calculator:
https://www.desmos.c...ator/0hqtm8mw1u
#5
Posted 26 March 2022 - 03:59 PM
What is exactly your problem?
As far as I would understand:
You are in Graph Mode (Menu -> 5).
You are using r = <term>.
You want to use differential/integration in OPTN -> Calc Menu.
In the casio docs for differential/integration (Go to SHIFT -> 4 Catalog -> <your command> -> QR) it is stated that you can only use "X" as the variable. That cannot be changed.
What's the problem? just use X instead in your formula.
The Graph editor uses an X/x if you have Y = <term> and (theta) for r = <term>.
The differential uses X/x for calculation.
I can't use x when using r = <term>. and the graph becomes a straight line if I use Y = <term>
#6
Posted 31 March 2022 - 05:44 AM
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