Strange behavior on G1 version 2.1.14588 (2021 05 05))

[rprosperi]

Same result on a 48 and on a 50g (in approx mode, same as Prime Home).

It's an artifact of how these are calculated internally, probably using logs, though this latter part is just a wag.

In approx mode, SIN(Pi) is not 0.00, it's -2.06761537357E-13), so the math is correct.