(d)/(dx)((1+cotx)/(1-cotx))...

`(d)/(dx)((1+cotx)/(1-cotx))`

`(2)/(1-sin2x)`

`(2)/(1+sin2x)`

`(-2)/(1+sin2x)`

`(2)/(sin2x-1)`

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The correct Answer is:

DIFFERENTIATION
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