i'm confused about that method:(adsbygoogle = window.adsbygoogle || []).push({});

1) when proving that method works, why do you have to make u and v satisfy the 2nd condition u`y1+v`y2=0

2) when you're integrating to find yp, why do you leave out the constant that results from the integration?

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# Homework Help: Solution by variation of parameters

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