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If y=tan^-1((1+x)/(1-x))then dy/dx=...

If `y=tan^-1((1+x)/(1-x))`then dy/dx=

A

a)1

B

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

C

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

D

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

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