Lets say I want to find the intersection point between the line l in parametric form and plane p, both mentioned in the Maple code below. Is there smarter way than using the solve method that I use the two final lines? 

with(geom3d);
plane(p, 2*x+y-3*z-3 = 0, [x, y, z]);
                               p
line(l, [-1+3*t, 1+t, 2-t], t);
                               l
intersection(I, p, l);
                               I
solve({x = -1+3*t, y = 1+t, z = 2-t, 2*x+y-3*z-3 = 0}, {t, x, y, z});
                  {t = 1, x = 2, y = 2, z = 1}
 

using the package geom3d

if I define two planes and attempt to find angle between them.

p1: 12-6*x-6*y-4*z = 0

p2: 3*x+3*y+2*z-6=0

and use the command FindAngle(p1,p2) then it returns arccos(2/11) any way to force maple to return a result in degree?

Dear Sirs, 

Can someone explain to why if I load Real Domain, that the derivate of a function at certain value comes out like in screendump? 

Thanks in advance :)  

https://imgur.com/a/sHJEj

Fred

Hi I teach math, 

And I seek help to make the following. 

Lets say you have a function f(x)=x^3-x^2-4*x+12 and you want make a Maple demonstration which shows the students first how they find the extreme-points of this function by first solving f'(x) = 0 -> 3x^2 - 2*x - 4=0 and then taking the two extreme points and calculating the slope the tangent on their respective left and right side of the point x =. And then outputting.

Since the slope of the tangent on the left side x = .... is positive and the slope of the right to the right of the point is negative, then  x = ..... is a local max.

Since the slope of the tangent on the left side x = .... is negative and the slope of the right to the right of the point is positive, then  x = ..... is a local minimum.

I know that this can be done using FunctionAnalysisTutor from the StudentCalculus1, but since I teach student whos first language is english, I would to be able to do a worksheet/document which shows the above mentioned textoutput. It is possible? If yes if anyone has ideer howto do this? I would very much appriciate some input.  

best regards

Fred