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The derivative of the function cot^(-...

The derivative of the function `cot^(-1){(cos2x)^(1//2)}` at `x=pi//6` is `(2//3)^(1//2)` (b) `(1//3)^(1//2)` (c) `3^(1//2)` (d) `6^(1//2)`

A

`sqrt((2)/(3))`

B

`sqrt((1)/(3))`

C

`sqrt(3)`

D

`sqrt(6)`

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A
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