1.

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

A. y<sub>p</sub> = 4 cos u2061x 3 sin u2061x
B. y<sub>p</sub> = 2 sin u2061x 4 cos u2061x
C. y<sub>p</sub> = 3 cos u2061x + 4 sin u2061x
D. y<sub>p</sub> = 2 cos u2061x 4 sin u2061x
Answer» E.


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