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Test "Differential Equations" (2 hours). 345 p.

Solve these differential equations.

1.28 y′ – 2xy = xe–x2

2.28 3extgydx = (1 – ex)sec2ydy

3.28 1 + y′2 + yy′′ = 0

4.28 y′′ − 3y′ + 2y = e3x(3 – 4x), y(0) = 0, y′(0) = 0

5.28 y′′ + y = 1/cos3x
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