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If x+ y = tan^(-1) y and (d^(2)y)/(dx^(2...

If `x+ y = tan^(-1) y and (d^(2)y)/(dx^(2)) =f (y) (dy)/(dx)`, then f(y) =

A

`(-2)/(y^(3))`

B

`(2)/(y^(3))`

C

`(1)/(y)`

D

`(-1)/(y)`

Text Solution

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The correct Answer is:
B
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