Inconsistent Deg/Rad in CAS

[Albert Chan]

Hi, GregP

Yes, I tested in CAS side. HP Prime emulator build 2.1.14181 (2018 10 16)

With degree setting, ARG(3+3.*i), ARG(3+3*i), ARG(3∡45) all give back 45.

Have you also tried using polar() ?

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I would have guessed ARG(z) always return radians, regardless of angle settings.
Somehow, having it return degrees looks weird to me.

BTW, XCas (1.5.0-63 win32) in degree settings, we also have this issue.

XCAS> arg(3+4*i) → 53.1301023542
XCAS> arg(3+4.*i) → 0.927295218002
XCAS> polar(3+4i) → (5, 53.1301023542)
XCAS> polar(3+4.i) → (5.0, 0.927295218002)

Lucky for me, I don't use degree settings