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If x = int (0) ^(y) (dt)/( sqrt (1 + t ^...

If `x = int _(0) ^(y) (dt)/( sqrt (1 + t ^(2))),` then `(d ^(2) y)/(dx ^(2))` is equal to

A

y

B

`sqrt (1 + y ^(2))`

C

`(x)/( sqrt (1 + y ^(2)))`

D

`y ^(2)`

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The correct Answer is:
A
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