Casio fxcg 500, FX CP 400

[ijabbott]

(01-24-2024 06:40 AM)Csaba Tizedes Wrote:  

(01-23-2024 05:58 PM)richmit Wrote:  How do you "turn on polar form display"?

On other CASIOs there is SETUP \ Complex mode \ r<theta, choose this display format, then jump to Main and type eg. (-) 2 EXE

If OS follows the other CASIOs "feature" you will see 2<-180 instead of -2, which is more than a little glitch, this is a huge mistake, try to imagine that student whose no any knowledge about complex numbers. Try to imagine that teacher whose need to instruct students one-by-one to fix this problem.

I got 2∠180 or 2∠π on an fx-9860GII and that is what I would expect to see in r∠θ mode. I would not expect to see −2 because a negative modulus makes no sense (or at least it would not be in the simplest form), mathematically. For what it's worth, HP calculators such as the HP-42S do the same thing.

If a student has no knowledge of complex numbers, then they shouldn't be setting the calculator to that mode!

Going back to the ClassPad II calculators, I don't have any, but looking in the manuals I cannot see any options for changing the default complex display format. However, there are various functions compToPol, compToTrig, and compToRect that will show a complex number parameter in different forms. In radians mode, compToPol will display the number in exponential form \(r\cdot e^{\theta\cdot i}\), otherwise it will display it in polar form \(\angle(r, \theta)\). I suspect that compToPol(−2) would be shown as \(2\cdot e^{\pi\cdot i}\) (radians) or \(\angle(2, 180)\) (degrees) or \(\angle(2, 200)\) (grads).