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If f(x) =1/2 ( sin x+ cos x) + ce ^(-x),...

If `f(x) =1/2 ( sin x+ cos x) + ce ^(-x), ` then the vlaue of `[f ' (x)+ f(x) ]` is=

A

`sin x `

B

`cos x `

C

`2 sin x`

D

`2 cos x`

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The correct Answer is:
B
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