1.

For all n in N, x in R, tan^(-1) [ ( x)/( 1.2+ x^2) ] + tan^(-1) [ (x)/( 2.3+ x^2) ] + …. + tan^(-1) [ ( x)/( n(n+1) +x^2) ] =

Answer»

`tan^(-1) [ (X)/( N) ] - tan^(-1) [ (x)/( n+1) ]`
`tan^(-1) [x] - tan^(-1) [ (x)/( n+1) ]`
`tan^(-1) [n+1] - tan^(-1) [x]`
`tan^(-1) [x]`

Answer :B


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