There isn't a bug.. you're the bug..
You need to set the calc in radians and use the grade symbol (as you used on the previous screenshots).. The problem is that the calc takes the values by default on radians regardless of the mode that you have set.
you're right.. but it's as you say only in os3.01 and it's a bug anyway!!
in OS 2.20 we have:
in degree mode:

in radian mode:

as you can see in the screenshots above, the default is radian .. so that every value you enter, the os transforms it into radian and then does the calculation!!!
and in os 2.20 it transforms it into radian corectly!!
as a result it gives the correct answer in both degree & radian mode!!
but here in os3.01 we have:
in degree mode:

in radian mode:

as you can see.. it only does the correct calculation in radian mode..... but in degree mode it makes 65 degrees equal to 66 radians which is wrong and very serious!!!
all of my calculations have to be in degree mode and I cannot switch between degree and radian mode in the middle of my calculations!!!
as you see it is a bug!! and a very great and serious bug which has to be fixed!!!
could be a bug.. but the manual could have an answer to this. If the manual have an answer.. i gonna blame you because all the propaganda that you deployed unnecessary
the manual have no answer to this!!! this is a calculator and have to be able to calculate in both degree and radian mode!!!
if I'm wrong .. so why does OS 2.2 gives the correct answer while OS 3.01 gives the wrong answer!!!
this problem has to be fixed by casio!!!
anyway .. I defined a function for my polar calculation " define PH(x)=cos(x)+i*sin(x) " .. which helps me to go through this bug!!! and it's working for now!!!!!!
& sorry about the first post!! I was really angry with CP & I wrote like that