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Variable x and y are related by equation...

Variable x and y are related by equation `x =int_0^y (dt)/sqrt(1+t^2)`. The value of `(d^2y)/(dx^2)` is equal to

A

`y`

B

`sqrt(1+y^2)`

C

`sqrt(1+y^2)`

D

`y^2`

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The correct Answer is:
A
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