1.

Find the Particular integral solution of the D.E (D2 – 4D + 3)y = 20 cos x by the method of undetermined coefficients.

A. yp = 4 cos⁡x – 3 sin⁡x
B. yp = 2 sin⁡x – 4 cos⁡x
C. yp = – 3 cos⁡x + 4 sin⁡x
D. yp = 2 cos⁡x – 4 sin⁡x
Answer» E.


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