1.

d/(dx)(Tan^(-1)""(x)/(sqrt(a^2-x^2))=

Answer»

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

ANSWER :D


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