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If f(x)=cot^-1((x^x-x^(-x))/2),thenf'(1)...

If `f(x)=cot^-1((x^x-x^(-x))/2),thenf'(1)` is equal to

A

`-1`

B

1

C

`log 2`

D

`-log 2`.

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