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Differential Equations – 3

3. The differential equation formed by y= acos+ bsin+ 4 where a and b are arbitrary constants is :

(a) (d2y/dx2) + y = 0
(b) (d2y/dx2) – y = 0
(c) (d2y/dx2) + y = 4
(d) (d2y/dx2) – y = 4

Answer : (c)

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