a:=5:b:=10:
c:=a%+b=a+b;
 

Unless the infectious desease can be modeled by a pendulum or something, MapleSim would not really be your tool of choice. How is this a mechatronical engineering task? 

Do you have an example for hfloat?

Regarding splitting the integration, see ?IntegrationTools,Expand

Maybe just the brackets are missing, i.e. try

f:=x->x^2;(simplify@eval)(f(x),x=sin(x)+cos(x));

But I'm not sure if this is generally more readable.

with(GraphTheory): g := Graph({{"azertyuiopqsdfghjklmwxcvbn", 1}, {"azertyuiopqsdfghjklmwxcvbn", 2}}): DrawGraph(g, style=tree, root="azertyuiopqsdfghjklmwxcvbn",stylesheet = [vertexcolor = "White",vertexborder=false])

Do you mean the vertical bar at the location of the cursor? Try to insert a new input line by pressing control-J (see Insert menu)

try to make it inert with %

2%/6*%int(10*cos(2*Pi*t/3),t=-1..1)

restart;

f:=sin(x);

solve(f,x,AllSolutions);

Pi*_Z1~ 

The underscore of variable Z1 indicates that it is generated by Maple and not by the user, the ~Symbol means that there is an assumption for _Z1, check with

about(_Z1);

Originally _Z1, renamed _Z1~:
  is assumed to be: integer
 

evalf(2*Pi*440)

pi is just a symbol, use Pi 

The problem is, you are not defining a function, read this chapter here: https://www.maplesoft.com/applications/view.aspx?SID=1513&view=html

you have to simplify the result

sum(sin(k), k = -214748364 .. 214748364);simplify(%);

@Nemo_ 

assign would be the natural choice

G := {A=exp1,B=exp2};assign(G);A,B; 
 

do you mean it like this?

M1:=((1/6)*sqrt(3)+(1/2)*I)*Matrix([[1,-I],[-I,1]]);

f:=(1/6)*sqrt(3)+(1/2)*I;
M2:=map(x->x/f,M1); 
`%*`(f,M2);
value(%);

Put a colon after the assignment a:=1, before the loop for j... begins.

expand(exp(-n*ln(2*Pi)));

combine(%,power);