acos question

[mmike]

Hi,

I'm not sure if that's a bug or just the way Mathcad calculates it.

acos (and others) will not calculate correctly the answer if the units are specified, whereas cos will behave correctly.

Attachment is in mathcad 14.

Is this how things are? i have to keep jumping between rad and deg on the equations so i can't really set the default units. ( i type manualy which number is in deg).

thank you,

Mike

[ValeryOchkov]

Sorry,

An argument of the function cos, sin etc is an angle!

But cos, sin etc return not an angle.

acos(45 deg) is equal for example e = 155.746 deg

acos(... rad), acos(... deg) etc return not a value but an error messege in Mathcad PM - see http://communities.ptc.com/groups/mathcad-pm-prime-minister

[mmike]

ok,

i better be more carefull next time . . .