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

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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