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If sec^(-1)((1+x)/(1+ y)) = a, then (dy)...

If `sec^(-1)((1+x)/(1+ y)) = a`, then `(dy)/(dx)` is

A

(y+1)/(x-1)

B

(y-1)/(x+1)

C

(x-1)/(y+1)

D

(x-1)/(y-1)

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The correct Answer is:
B
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