1.

If f(x) is a function of x such that (1)/((1+x)(1+x^(2)))=(A)/(1+x)+(f(x))/((1+x^(2)) for all x in R then f(x) is

Answer»

`(1-x)/(2)`
`(1+x)/(2)`
`1-x`
`1+x`

ANSWER :A


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