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Mathematics 12 Online
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)

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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