Grapher having trouble with trig functions

Well I thought that I could make some cool visuals for my math class by using grapher instead of just making charts and graphs in Excel on my pc, but no dice with that idea. I created all the different variables (and how they related to x, ie x^2*(5-x6)/x=m) and it was pretty cool how it would all come together and I could use those variables in other equations instead of writing it all out (stuff like y=4x^m-m/5). (Those are examples, not anything I used)
Everything seemed fine until I tried to use a cosine function in one of the equations. It seemed really intuitive and recognized cos as cosine and not the variables c, o, and s multiplied, so I thought "great!" Then when I entered it the graph didn't appear anything like it should have. It gave me a Richter scale instead of a slightly curved line. I spent about half an hour trying to find my own error but then realized maybe there was something wrong with the program. I tried just plain old cos(x) and found that it was completely off. Instead of traveling from 0,1 to 180,-1 like it should have, it went from 0,1 to 3.1475,-1. This was way off so I tried a sine function and that did the same exact thing (having a period of roughly 6.295 instead of 360!). These functions were way off, and I'm using an intel macbook from my school (with 10.5), so I thought maybe someone changed the settings, so I tried them them on my aunts g4 macmini (10.4.11 I think) and it gave me the same problem!
Anyway what's wrong with the trig functions for Grapher and how can I fix them?

Emzz, I'm running 10.5.5 (Intel) and Grapher v2.0. My version of Grapher supports changing Trigonometric Mode, so the absence of this option seems to have nothing to do with Leopard.
But let's do some Math now. As you surely know the cosine has (besides others) a root at 90 Degrees in the unit circle. Now let f : (angle in Degrees) -> (length of the corresponding arc of the unit circle) be a mapping. For 90 Degrees f yields 0.5*Pi. That means cosine has a root at 0.5*Pi in Radian unit.
Now, if you swith Grapher's Trigonometric Mode from Degrees to Radian, cosine will no longer have a root at 90 but at approximately 1.57. Hope that explains a bit...
By the way, Radian is the standard unit of angular measurement when it comes to trigonometric functions. For more details about Radian see [this article at Wikipedia|http://en.wikipedia.org/wiki/Radian] (click the link to be redirected).
I suggest you close this topic because, as you already noted yourself, your initial question is answered.
Good computing.
floba
(MN576)
Message was edited by: floba

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