Question: variation of parameters step by step or integration step by step

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

but it can't solve this problem, is there any other way to have maple integrate this and is there a way to show me how to do it step by step?

Thanks in advance!

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