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If y = cot^(-1) ((1 -x)/(1 +x)) " then ...

If `y = cot^(-1) ((1 -x)/(1 +x)) " then " (dy)/(dx) =` ?

A

` (1)/(1+x^(2))`

B

` (-1)/(1+x^(2))`

C

` (x)/(1+x^(2))`

D

` (-x)/(1+x^(2))`

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The correct Answer is:
A
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