The order of the differential equation whose solution is \[y=a\cos x+b

1.	The order of the differential equation whose solution is \[y=a\cos x+b\sin x+c{{e}^{-x}}\]is
A.	3
B.	2
C.	1
D.	None of these
Answer» B. 2

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The order of the differential equation whose solution is \[y=a\cos x+b\sin x+c{{e}^{-x}}\]is

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