Perhaps it could be done using a maplet in a similar way used in the fifa simulation by Robert Israel http://www.mapleprimes.com/posts/94471-FIFA-Simulation

Alternatively one could employ

e:=exp(1) in their maple.ini file

hence making the value e known to maple that you want it as the exponential.  Similarily one could use the same tactics for changing I to J for -1 by a slightly different tactic.

interface(imaginaryunit=J)

Keith Geddes and Gaston Gonnet

..a link http://www.mapleprimes.com/posts/40040-Gaston-Gonnet

Aside from the crtl-c crtl-v 'ing a few spaces.  There is a program called Hotkey bind (free of course) where you can set up a hotkey combination to insert 5 spaces for example.  Again it won't solve the importing of older documents it will help in the creation of future documents. 

I just loaded hotkey bind and set up crtl-t to insert 5 spaces ... it works quite well. 

I think the command surfdata confuses many people.  It doesn't actually create a 3d surface of the data like the way people are thinking.  There have been many posts on the topic.

Here's one post that might get you started http://www.mapleprimes.com/questions/200084-What-Is-Going-Wrong-With-My-3D-Surface-Plot-grid

Yes first derivatives at a point being positive will determine whether your function is increasing. 

Solving for f'(x)=0 will find points of inflection and second derivatives at that point will determine whether it's a local minimum or maximum.

combine( sin(4x)^2)
                                

expand(%)

convert(sin(4x)^2,cos)

crtl + shift + "   -   will get you into the overscript.

I don't think so. 

The only way I know is a workaround - type the comments under a different character style and change the color so it isn't visible and then to view it again change the color back to black.

**edit ** slightly misread the question.  This blanks out visibly the commented sections so you don't see them but I see now you wanted sections commented out so they won't execute.  changed the title to reflect my answer.

I came up with this answer integrating by parts using x^6

or simplify(%)

integrating by parts using x^12 brings this

The question is similar to this one.

http://www.mapleprimes.com/questions/149897-Calc-II-Related-Question

Personally I prefer to solve by parts.

@wzelik

Yes there is a workaround for 13 and older.  See the link in the replied answer above.  By introducing a secondary pde the correct solution is obtained. :)

Similarily with two lines I would not expect to have to assume anything

with(geom3d):
line(l1, [a1*t+x1, b1*t+y1, c1*t+z1], t);
line(l2, [a2*s+x2, b2*s+y2, c2*s+z2], s);

distance(l1,l2)

Error, (in geom3d:-distance) unable to determine if two lines are parallel or skew

I expect

    (b1c2-b2c1)(x2-x1)-(a1c1-a2c1)(y2-y1)+(a1b2-a2b1)(z2-z1)
d= ---------------------------------------------------------------------
     sqrt[ (b1c2-b2c1)^2 + (a1c2-a2c1)^2 + (a1b2-a2b1)^2

There may be a third part program that could do that, but not in Maple.  The third party program I had in mind was hotkey bind, but then I'm not sure that program can do that.

Otherwise selecting with your mouse and using the usual crtl-c crtl-v will have to suffice.

crtl-l can select the evaluated input (output) but not the actual commands for the input.  I had a similar question a long time ago about recalling the commands that produced a certain output. 

Suggestion to Maplesoft - CRTL-SHIFT-I  could be a shortcut key to enter the last input .. might be a handy little shortcut for Maple