Why int gives this error? Is this a known problem?

Update

fyi, This is reported to Maplesoft.

Here is updated worksheet. The int() command does not generate the error the second time it used, but generates the error the very first time used. Hopefully will be fixed in 2022 Maple.
 

Download int_problem_feb_13_2022.mw

I need to use convert of complex exponentials to trig, but only to convert exp(I*x) to cos/sin using Euler formula.

The problem is that, since this is done in code without looking at what is inside the exp(), Maple will also convert non complex exponentials as exp(x) to hyperpolic trig which I do not want.  An example will make this clear

For an example, given exp(3*I*x - x)  and applying convert/trig to this it gives 

             (cosh(x) - sinh(x))*(cos(3*x) + sin(3*x)*I)                       --(1)

But I only want to conver the exp(3*I*x) part of the of the above to obtain

          exp(-x) *  (cos(3*x) + sin(3*x)*I)                          ---(2)

I can break  exp(3*I*x - x) first using expand command and obtain  exp(-x) * exp(3*I*x) and then parse this and filter out the complex exponentials (may be using select with has I) and then use convert on those terms only leaving the non-complex exponentials alone. But this gets messy for more complex exponentials.

Is there an easy way to tell Maple  to convert expression of the form exp(I*f(x) + g(x)) to trig but only to sin/cos, hence leaving the exp( g(x) ) as a factor? I looked at help but see nothing there so far.

Maple 2021.2

On my PC I can't see the plus and minus sign in the quotient expression when using Student:-Basics:-LongDivision.

Is this a know display issue and is there to correct it?

Windows 10, Maple 2021.2

Download no_signs.mw

I noticed Maple changes 1/(4*(x-2)) to 1/(4*x-8)  when copying the output and pasting it back to the worksheet.  

But in the variable it does remain 1/(4*(x-2))  which is what I wanted, as I am going to look for this form later on and I do not want it expanded.

But I am curious why Maple does this. It is a little annoying when copying something from one worksheet to another and have it change.  Here is a small movie and the code to see it. 

Is there a way to prevent this automatic expansion?  Maple 2021.2 on windows 10

code

r:=(x^4-8*x^3+24*x^2-24*x+12)/((4*x^2*(x-2)^2)):
rf:=convert(r,fullparfrac,x);

I use worksheet interface and have my display settings as the following

Many times when using the debugger, and hitting the NEXT button I get the message

   Warning, cannot determine statement number; procedure may have changed in-place

The problem is that after this, hitting NEXT will not go to next statement any more. It will bypass and return from the current procedure. but hitting STEP will make it go to next statement, But STEP will also go into next block which I might not want to do.

Only way to fix this is to terminate the debugging session and start all over again.

it is random and comes up in different places. The code in in .mla file and I step through it.

I am sure anyone who have used the buildin debugger have seen this message before. It shows for me many times. 

What causes it and what can one do to not make it show up or clear it up so one does not have to restart the debugging each time it shows up?

Here is a screen shot.  I am also wondering if this happens using the emacs interface to the Maple debugger? I have not used the emacs interface to the debugger before.

Maple 2021.2 on windows 10