I'm working on a school problem and I came across a little problem which I can't figure the solution by hand, so I'm resourcing to maple for this. I have this problem: solve by variation of parameters y"+9y=sinh(2x)

I can do the wronskian and everything fine up to the integration part, which is: integral[(-1/3)sinh(2x)sin(3x),x]

I found the integration step by step of maple
Student[Calculus1][IntTutor]();

but it can't solve this problem, is there...

If you work with Maple on a daily basis sometimes you come across
things that seem impossible to do. Yesterday I tried to have two colors
in a histogram ie -3..-1 = red and -1..3 =blue but I could not figure
out how to do it...hummm.....any suggestions?

restart:
with(Statistics):
with(plots):

n:=5000:
A:=Sample(RandomVariable(Normal(0,1)),n):

Histogram(A,bincount=100, color=blue);

Hello all,

I have a little problem with an expression I have to develop in taylor/series.

Here it is:

I want to develop it in "nu", giving that "nu" is a small parameter, and it says that it doesn't exist a series expansion.

But when I can obtain the series expansion of the "sqrt" part only of the expression, which yields:

I am not able to format the number along the axis of a 2D plot to use period as the decimal separator - and not to have different number of positions after the decimal on the x- vs. the y-axis either.  I have set the Windows language/region to the US.  Anyone who might help?  Regards,

Hello all,

I have a problem in comparing two expressions. I have to verify they are equal, but I am totally stuck even if it is obvious it is correct (but I have to do it with Maple).

These are the two expressions:

http://www.hostingpics.net/viewer.php?id=312636maple.png

I tried to convert them into exp, but it doesn't work at all...

Thanks a lot for your help, Julien

Hi, everyone, I am sorry that I have to post this question again since the last post sank and I did not give example at that time. In the example I post here, A[e,res1] and A[e,res2] are supposed to be the same theoretically. However, as I  used numeric solver (fsolve), they are 2 order different. Can anyone try the code and tell me what mistakes I made? I appreciate that.

> restart;
> with(PDEtools);
>
>
> # Electron velocity distribution:

dear friends, I want to solve this integration with numeric methods. when i type it as nested integrals i reach the first answer, but when i want to use int(int), maple doesn't solve it(second answer). what's wrong with the input?

I've been trying to numerically solve (and then plot) this set of equations, to reproduce results from a scientific paper (Berro et al., BPJ 2007). Maple tells me that some matrix is singular - any idea what I can do differently?

Any help much appreciated.

> eqn1 := 15*(diff(theta(s), `$`(s, 2))) = N3(s)*cos(theta(s))-N1(s)*sin(theta(s));                    ...

I want to fsolve one non-linear equation as follows: expr_1/expr_2=C which can not be solvable in maple directly. However, once I use expr_3=simplify(expr_1/expr_2) and then expr_3=C, it returns a result. Something weird happens now. Once I substitute the result in expr_3, it returns a value the same as C. But if I substitute the result in expr_1 and expr_2 respectively and then do a division, the outcome is dramatically different from C, which makes no sense at all. Is it...

Following the last question: After eliminating the units, the equation is still not solved. Such kind of equation is not solvable at all, even numerically? Thanks.

PS: Is it possible to edit a posted question? Sometime I want to add more information but could not edit the old one.

Hi, again, I am a physist. It is convenient to solve problems in presence of units. I have a equation (1-variable) including a erf function to solve. As I substute all the constants (with units) and then use 'solve'. It returns a warning without any result. I am not really familiar with the numeric package in maple. Could anyone give me some advice? Thank you.

Hi, I am a green hand of Maple. I guess this is a common question for many users. Some times, Maple can not deal with an integral with a lot of symbols. However, if I manually simplify the integral somehow so that less simbols are left, keeping the main feature of the integral unchanged, it works. Thus, my question is: Is there some limitation that number of simbol can appear in the integral? What decides whether a integral works or not? Thank you.

hi dear friends

i want to solve this int with numeric methods such that doesn't contain erf function

thanks alot

(my function is e1, and I want to calculate the int of e1)

With the idea developed by Robert Israel on the