1.

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

Answer»

`a = B= C = d `
`0,1,-1,0`
`1,0,-1,0`
`0,1,1,0`

ANSWER :D


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