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3. (a) Determine the general solution of the differential equation dy dx cosx + ysin.x = e cosx giving your answer in the form

3. (a) Determine the general solution of the differential equation dy dx cosx + ysin.x = e cosx giving your answer in the form y = f(x) Given that y 3 when x = 0 (b) determine the smallest positive value of x for which y = 0 (3) (3)

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