1.

(d)/(dx)[tan^(-1)((a-x)/(1+ax))] is equal to

Answer»

`-(1)/(1+x^(2))`
`(1)/(1+a^(2)) - (1)/(1+x^(2))`
`(1)/(1+((a-x)/(1+ax))^(2))`
`(1)/(SQRT(1-((a-x)/(1+ax))^(2)))`

ANSWER :A


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