Differential equation by variation of parameters
Solve the differential equation by variation of parameters
y" + y = sec(x)
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A large tank with capacity of 100 gallons haves 50 gallons of pure water. A salt solution with oncentration of 0.1 lb/gal flows in the tank at a rate of 4 gal/min. The mixture is kept well stirred and flows out of the tank at rate of 2 gal/min. C
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Compute the general solution of the given differential equation
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