to get you started:

http://www.maplesoft.com/support/help/Maple/view.aspx?path=dsolve

write code in copy-pasteable format please...

@xoanne 

The syntax is more like this:

sys := diff(y[1](t),t,t) = -y[1](t)/sqrt(y[1](t)^2+y[2](t)^2)^3, diff(y[2](t),t,t) = -y[2](t)/sqrt(y[1](t)^2+y[2](t)^2)^3;
ini := y[1](0) = 1, y[2](0) = 0, (D(y[1]))(0) = 0, (D(y[2]))(0) = 1;
dsol := dsolve({sys,ini});

You have 2 second-order odes so 4 conditions should be needed, if I'm not mistaken. Adding -y[2](t)/sqrt(y[1](t)^2+y[2](t)^2)^3 = 0 would essentially makes y[2] into a constant, I don't think that's what you mean is it?

@xoanne 

The syntax is more like this:

sys := diff(y[1](t),t,t) = -y[1](t)/sqrt(y[1](t)^2+y[2](t)^2)^3, diff(y[2](t),t,t) = -y[2](t)/sqrt(y[1](t)^2+y[2](t)^2)^3;
ini := y[1](0) = 1, y[2](0) = 0, (D(y[1]))(0) = 0, (D(y[2]))(0) = 1;
dsol := dsolve({sys,ini});

You have 2 second-order odes so 4 conditions should be needed, if I'm not mistaken. Adding -y[2](t)/sqrt(y[1](t)^2+y[2](t)^2)^3 = 0 would essentially makes y[2] into a constant, I don't think that's what you mean is it?

as Joe says, please clarify the question by example, showing the code, copy-pasted as text not as image.

stay away from 2-d input as Preben recommends! If you use 1-d input , you can still have 2-d output, that way you can compare your Maple worksheet formulas with your pen and paper formulas. These are standard options you can access through the menu.

Tools --> Options -->Display

Input display: Maple notation

Output display: 2-D Math notation.

for instance.

When you select a formula from your worksheet to paste into mapleprimes, sometimes an image is pasted (this is what happened above), this is not always what you want, sometimes it's better to paste text, that way others can copy-paste your formula and quickly double-check. Not everyone can be bothered to download and open a worksheet. Especially as some forum participants, such as myself, have access to Maple only at work but will read the forum from home --- canny read it my friend.

stay away from 2-d input as Preben recommends! If you use 1-d input , you can still have 2-d output, that way you can compare your Maple worksheet formulas with your pen and paper formulas. These are standard options you can access through the menu.

Tools --> Options -->Display

Input display: Maple notation

Output display: 2-D Math notation.

for instance.

When you select a formula from your worksheet to paste into mapleprimes, sometimes an image is pasted (this is what happened above), this is not always what you want, sometimes it's better to paste text, that way others can copy-paste your formula and quickly double-check. Not everyone can be bothered to download and open a worksheet. Especially as some forum participants, such as myself, have access to Maple only at work but will read the forum from home --- canny read it my friend.

didn't work here either...

didn't work here either...

so your problem is downloading the file, correct? what's the url, so we may try to see if we can.

if you copy-paste your code in an editable copy-pastable format, you're more likely to receive help than by posting an image of the code that is not directly useable.

if you copy-paste your code in an editable copy-pastable format, you're more likely to receive help than by posting an image of the code that is not directly useable.

and what's your best shot?

@johan162 

I second this suggestion Johan, good idea!

I can confirm observing this behaviour, in Maple 15, both classic and standard. The help files on RealDomain does state that errors can occur in this context, but I couldn't see much detail there.

@Joe Riel 

Good that you've found the problem. I experienced something like this with firefox a little while ago (I forget the details, but I couldn't log on to some places and had to use another browser to do that, much like your issue), and it turns out that it was some add-on I had installed which was interfering (it was some ad-blocker, but I forget which one exactly). So after clearing cookies the next place to look is interfence from add-ons.