Pi/2 radians different from 90 deg?

[Artur - Brasil]

(12-13-2021 06:54 PM)Joe Horn Wrote:  ... then use CAS view, in which "tan(pi/2)" returns +/- infinity.

Interesting, but: 1/0 also gives +/- infinity ??? (I don't have the Prime).

When the angle aproximates 90 degrees, the tan goes to +/-infinity, but tan(90o) --> error, isn't it?

Best regards,
Artur