# Finding the particular solution to the differential equation

1. Mar 6, 2013

### mokee92

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

Please see attachment. im supposed to compare coefficients but it doesn't seem possible. what do I do next? (also, if i have posted this in the wrong forum...I apologize. please mention the right forum) Thanks

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2. Mar 6, 2013

### Staff: Mentor

Your particular solution is too complicated. Try yp = A cos5x + B sin5x.

3. Mar 6, 2013

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4. Mar 7, 2013

### Staff: Mentor

Why don't you check it for yourself? Just substitute your particular solution into the differential equation.

Also, the pictures you took are difficult to read. The lighting is poor and taking the picture at an angle to the paper makes the upper part of the paper difficult to read.

5. Mar 7, 2013

### LCKurtz

It seems to me we are seeing more and more of this. Pictures, sometimes one for the problem and one for the solution effort, links to pdf's etc. Anything but typing in the problem so we have an editable posting to work with. I wish PF would make a stronger effort to discourage that. Often I just skip over such posts.

6. Mar 7, 2013

### mokee92

I apologize

I cant seem to work with the editor so taking pictures seemed like a better option. Anyways, thanks for your help. I still don't know whether my A and B are right.

7. Mar 7, 2013

### LCKurtz

No problem mokee; my comments were directed to Mark44 who is a moderator. You didn't violate any rules. To check whether your A and B are right, plug your answers in to the original equation and see if they work, as Mark suggested.