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| Math Central | Quandaries & Queries |
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Question from Shih-ya, a student: How do you solve y'' + y = 0 |
We can see at least two solutions right away, Shih-ya.
1. If y = 0, then y'' = 0.
2. If y = sin x, then y' = cos x, then y'' = -sin x.
To find the general solution you need two linearly independent solutions. Can you find two linearly independent solutions?
Stephen and Harley
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