need help finding the angle between two vectors using maxima....



  Jack:

I fiddled with your attached wxmaxima file and maybe what I'm returning 
as another attached wxmaxima file will help a little. I guessed a little 
at what you were attempting so if I missed the mark, I apologize.

Paul Bowyer


On 09/28/2010 08:43 AM, Jack Snoots wrote:
> ok well here is the problem i am havin, hopefully someone will be able 
> to help.. r(t) = [2cos(t),3sin(t)], from this i am to find the angle 
> between v(3*%pi/4) and a(3*%pi/4), for whatever reason i cannot get 
> the angle. i do understand that theta = acos(v.a/(mag_v)*(mag_a)). ok 
> i actually didnt use mag_v command.  i set it up as norm, 
> norm(a):=sqrt(a.a)$ is what i did..and its still not working out for 
> me..any thoughts? i attached my work..maybe this weill help you see 
> where im going wrong...
>
> /*be ye steadfast, unmoveable, unshakable, always abounding in the 
> work of the Lord.....*/
>
>
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