The value of ("lim")(xveca)sqrt(a^2-x^2)...

The value of `("lim")_(xveca)sqrt(a^2-x^2)cot(pi/2)sqrt((a-x)/(a+x))` is (a) `(2a)/pi` (b) `-(2a)/pi` (c) `(4a)/pi` (d) `-(4a)/pi`

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