Test "Differential Equations" (2 hours). 345 p.
Solve these differential equations.
1.14 y′ + 2xy = xe−x2
2.14 xcosy/x(ydx + xdy) = x2sin(y/x)dx
3.14 y′2 + 2yy′′ = 0
4.14 y′′ − 4y = 3xe−x, y(0) = 0, y′(0) = 0
5.14 y′′ + 4y = 1/cos2x
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