1.

If y =2 Tan ^(-1) ((x sqrt2)/( 1 - x ^(2))) + log ((1+ x sqrt2 + x ^(2))/(1 - x sqrt2 + x ^(2)))then (dy)/(dx) =

Answer»

`(1)/(1 + x ^(4))`
`(2)/(1 + x ^(4))`
`(2SQRT2)/(1 + x ^(4))`
`(4sqrt2)/(1 + x ^(4))`

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