(lim)(xvec0^+)1/(xsqrt(x))("a t a n"^(-1...

`(lim)_(xvec0^+)1/(xsqrt(x))("a t a n"^(-1)(sqrt(x))/a-btan^(-1)(sqrt(x))/b)` has the value equal to `(a-b)/3` b. 0 c. `((a^2-b^2))/(6a^2b^2)` d.`` `(a^2-b^2)/(3a^2b^2)`

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