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I am trying to find the solution of the equation t $y''-(\cos x) y'+(\sin x )y = 0$.

I need help urgently.Thanks

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    Is there a $t$ in front of $y''$? If so is it a constant?2012-06-14
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    @What is that $t$?2012-06-14
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    Please make sure I didn't change your question unintentionally. I don't know what's that $t$ doing there, must be a typo.2012-06-14
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    someone has been researched this in another Q&A site: http://tw.knowledge.yahoo.com/question/question?qid=10111016097472012-06-14
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    This question has been solved perfectly. Hope that the asker has been diving enough and accept the answer at an early date.2012-09-10

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