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If f(x) = (ax + b) Cos x +(cx +d) Sin x ...

If `f(x) = (ax + b) Cos x +(cx +d) Sin x` and `f^(1) (x)` = x Cosx is an an identity in x then a,b,c ,d are given by

A

`a = b = c = d `

B

`0,1,-1,0`

C

`1,0,-1,0`

D

`0,1,1,0`

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The correct Answer is:
D
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