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Determine the order, dependent and independent variables of the given differential equation and state whether the...

  1. Determine the order, dependent and independent variables of the given differential equation and state whether the equation is linear or nonlinear.

    (a) xdy + exy = 2x + 1dx

    (b) yy′′ + 4y′ + y = 3t

    (c) (1+t2)x′′ +tx′ −x2 = 0

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