Not that it makes any difference but I had originally copied the unsimplified form.  I have changed it to the answer of the simplified Lagrangian.

@Samir Khan that works quite well.  On my computer the animation is a bit choppy

Thank you Kitonum for your solution.

And thank you to rLopez for his insightful solution. 

It helps to learn Maple with different approaches.

The newest Maple Player shows 18.01 build id 934120 so it must run on a different schedule since an update for maple 18.01 is not yet available,

@Markiyan Hirnyk


Build id's are present in all softwares and represent different maintenance build levels.  It is all in succession.  The largest build id number for your software will represent the most current software version. 

Of course Maple 18 is the most current version, however there is no place on Maplesoft to find the most current build id.

For example Maple 12.02 build id 377066.  I am sure the build id is tied into the Maple version 12.02 but can I be certain that buildid 377066 is the absolute latest with Maple 12?  I recall a minor maintenance upgrade to a maple version that did not include increasing the minor version number which of course would mean two different build id's for the same Maple version.  When upgrading anti-virus software you usually compare against build-id's to see if you have the latest.  How about for Maple?  I realize it's probably rare that an update will occur without a version change.  Currently there's no where to compare build id's, is there?

@acer I think the question there is why have a version # and a build id #

How do I know if it's the latest?  Are there different build id's for the same version?

@Markiyan Hirnyk And what should the build id be for the latest?

I am unable to view the docx file you presented.

Thank you, exactly what I was looking for.

Thank you, exactly what I was looking for.

@Alejandro Jakubi Near the end of the recorded webinar Maple17IndustrialApplicationsWebinar.mp4 we see the presenter moving through example 2 in what looks like document mode.  When the presenter clicks on the dsol1 line the { } brackets start flashing.  Muhummad wants to know how to do that.

@Muhummad Ali - Bracket matching is on by default, in 2d math mode the matching is represented by a flashing grey line under the equation.  The flashing yellow highlight brackets puzzles me as well.

@Carl Love That looks like a screenshot from the webinar.  I think he's asking how to get the yellow rectangle in document mode 2d math. 

Thank you for that approach.  Yes the initial condition change I was unsure about (didn't even know if I had it right) and a much appreciated explanation, thanks!

Thank you for that approach.  Yes the initial condition change I was unsure about (didn't even know if I had it right) and a much appreciated explanation, thanks!

Thank you for clearing that up.