1.

Ify = "cos^(-1)((2x)/(1 + x^2)), then (dy)/(dx) is

Answer»

`(-2)/(1 + X^2)` for all x
`(-2)/(1 + x^2)` for all `|x| LT 1`
`(2)/(1 + x^2)` for `|x| GT 1`
none of these

Answer :B::C


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