Question: 2x If y = e cos 5x then a = A. 4 is a solution of the D.E: y+ay'+by=0, a,beR D. 25 B. -4

2x If y = e cos 5x then a = A. 4 

2x If y = e cos 5x then a = A. 4 is a solution of the D.E: y"+ay'+by=0, a,beR D. 25 B. -4 C. -25

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