If for `x (0,1/4),`
the derivative of `tan^(-1)((6xsqrt(x))/(1-9x^3))`
is `sqrt(x)dotg(x),`
then `g(x)`
equals:
`(3x)/(1-9x^3)`
(2) `3/(1+9x^3)`
(3) `9/(1+9x^3)`
(4) `(3xsqrt(x))/(1-9x^3)`
A. `(3)/(1+9x^(3))`
B. `(9)/(1+9x^(3))`
C. `(3xsqrt(x))/(1-9x^(3))`
D. `(3x)/(1-9x^(3))`