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The derivative of the function cot^(-1...

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

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