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February 28, 2015

February 28, 2015

Posted by **aaa** on Wednesday, July 2, 2014 at 1:57am.

- math -
**Steve**, Wednesday, July 2, 2014 at 5:47amy" + 9y = cos2x+sin2x

You know that

y"+9y=0

has solutions

y = a cos3x + b sin3x

so the solution here is

y = a cos 3x + b sin 3x + (cos2x+sin2x)/5

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