# Question:Why Maple refuses to change location of constants unless doing restart?

## Question:Why Maple refuses to change location of constants unless doing restart?

Maple 2020

This puzzling to me. First will show the code, then explain the problem

```restart;
ode:=diff(diff(y(x),x),x)+8*diff(y(x),x)+25*y(x) = 1;
sol:=dsolve(ode);
sol:= y(x)= _C2*exp(-4*x)*sin(3*x)+ _C1*exp(-4*x)*cos(3*x) + 1/25;
sol:= y(x)= _C2*exp(-4*x)*sin(3*x)+ _C1*exp(-4*x)*cos(3*x) + 1/25;
sol:= y(x)= _C2*exp(-4*x)*sin(3*x)+ _C1*exp(-4*x)*cos(3*x) + 1/25;

restart;

sol:= y(x)= _C2*exp(-4*x)*sin(3*x)+ _C1*exp(-4*x)*cos(3*x) + 1/25;

```

I was trying to changing the constant of integrations, to make them show at front, where it is better. But Maple refused to do so. Here is the output:

 > interface(version)

 > restart; ode:=diff(diff(y(x),x),x)+8*diff(y(x),x)+25*y(x) = 1; sol:=dsolve(ode); sol:= y(x)= _C2*exp(-4*x)*sin(3*x)+ _C1*exp(-4*x)*cos(3*x) + 1/25; sol:= y(x)= _C2*exp(-4*x)*sin(3*x)+ _C1*exp(-4*x)*cos(3*x) + 1/25; sol:= y(x)= _C2*exp(-4*x)*sin(3*x)+ _C1*exp(-4*x)*cos(3*x) + 1/25;

 > restart;
 > sol:= y(x)= _C2*exp(-4*x)*sin(3*x)+ _C1*exp(-4*x)*cos(3*x) + 1/25;

 >

Why restart is needed to make Maple keep the output same as input? is it possible to rewrite it without having to do restart?