1.

If y=(2)/(sqrt(a^(2)-b^(2)))tan^(-1) [sqrt((a-b)/(a+b))tan""(x)/(2)]

Answer»

`(d^(2)y)/(dx^(2))""|_(X=(pi)/(2))=`
`(b)/(2a^(2))`
`(b)/(a^(2))`
`(2B)/(a)`

ANSWER :B


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