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OpenStudy (anonymous):
Find a particular solution to the differential equation y′′+9y=sec(3x) and Find a particular solution to the differential equation y′′+4y=sec^2(2t)
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OpenStudy (anonymous):
sry, having trouble with these trig identities
OpenStudy (tkhunny):
Have you yet found a General Solution? That would be a good place to start.
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