As I said in the comments I wrote plus instead of matrix multplication, so for my toy example use the same A and B, and then for C a matrix like 

( 0 i//-i 0)

@Rouben Rostamian  

sorri I wrote plus where I meant matrix multiplication. 

Thank you so very much!

Thank you so very much!

I tried command line with -s (back on 14- I have both installed right now), but it still wouldn't do it.  So it can't be the initialization files.  What linux are you using?  I'm on Ubuntu.  Anyway, just so you can see, the output is below.

lauren@pascal:~/maple14/bin$ ./maple -s
    |\^/|     Maple 14 (X86 64 LINUX)
._|\|   |/|_. Copyright (c) Maplesoft, a division of Waterloo Maple Inc. 2010
 \  MAPLE  /  All rights reserved. Maple is a trademark of
 <____ ____>  Waterloo Maple Inc.
      |       Type ? for help.
> int(lambda/(A+B*lambda)^2,lambda=0..1) assuming A>0,B>0;
                            1
                           /
                          |       lambda
                          |   --------------- dlambda
                          |                 2
                         /    (A + B lambda)
                           0

I tried command line with -s (back on 14- I have both installed right now), but it still wouldn't do it.  So it can't be the initialization files.  What linux are you using?  I'm on Ubuntu.  Anyway, just so you can see, the output is below.

lauren@pascal:~/maple14/bin$ ./maple -s
    |\^/|     Maple 14 (X86 64 LINUX)
._|\|   |/|_. Copyright (c) Maplesoft, a division of Waterloo Maple Inc. 2010
 \  MAPLE  /  All rights reserved. Maple is a trademark of
 <____ ____>  Waterloo Maple Inc.
      |       Type ? for help.
> int(lambda/(A+B*lambda)^2,lambda=0..1) assuming A>0,B>0;
                            1
                           /
                          |       lambda
                          |   --------------- dlambda
                          |                 2
                         /    (A + B lambda)
                           0

I did try the restart; that didn't work.  I'm on linux (64 bit Ubuntu).  I decided to go ahead and update, and that did fix it.  Although I'd like to know why it didn't work to begin with...

I did try the restart; that didn't work.  I'm on linux (64 bit Ubuntu).  I decided to go ahead and update, and that did fix it.  Although I'd like to know why it didn't work to begin with...

Guess I should update, then.  Thanks!

Guess I should update, then.  Thanks!

How strange...you ran the code exactly as I wrote it?  Because it just gives the integral back to me.  Thanks so much!

How strange...you ran the code exactly as I wrote it?  Because it just gives the integral back to me.  Thanks so much!

Thanks.  But is there no way I can tell Maple to solve assuming a positive discriminant?  My p's and q's are very complicated and I'm trying to put this in loops.  I'd prefer not to try to extract the coefficients if I could just do assume(positive discriminant) or something. 

Thanks.  But is there no way I can tell Maple to solve assuming a positive discriminant?  My p's and q's are very complicated and I'm trying to put this in loops.  I'd prefer not to try to extract the coefficients if I could just do assume(positive discriminant) or something.