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If y=(tan^(-1)x-cot^(-1)x)/(tan^(-1)x+co...

If `y=(tan^(-1)x-cot^(-1)x)/(tan^(-1)x+cot^(-1)x)` , find `((dy)/(dx)])_(x=-1)` 0 (b) 1 (c) `2//pi` (d) `-1`

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