1.

The differential equation for which `y=a cos x+b sin x ` is a solution, isA. `(d^(2)y)/(dx^(2))+y=0`B. `(d^(2)y)/(dx^(2))-y=0`C. `(d^(2)y)/(dx^(2))+(a+b)y=0`D. `(d^(2)y)/(dx^(2))+(a-b)y=0`

Answer» Correct Answer - A
We have,
`y=a cos x+b sin x`
`rArr" "(dy)/(dx)=-a sin x+b cosx`
`rArr" "(d^(2)y)/(dx^(2))=-a cos x-b sin xrArr (d^(2)y)/(dx^(2))=-y`


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