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OpenStudy (anonymous):
Verify that y=sin(3t)+2cos(3t) is a solution to the initial value problem 2y''+18y=0; y(0)=2, y'(0)=3
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OpenStudy (anonymous):
At first I thought to differentiate for y twice and plug the relevant results back into the IVP, but I don't know what to do with the initial values.
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