1.

If sqrt(x+y)-sqrt(x-y)=c," then "(d^(2)y)/(dx^(2))

Answer»

`(1)/(y)((DY)/(DX))^(2)`
`(-c^(4))/(4y^(2))`
`y((dy)/(dx))^(2)`
`(-c^(2))/(4y^(3))`

Answer :B


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