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If y=log(x+sqrt(x^2+a^2)), then (d^2y)/(...

If `y=log(x+sqrt(x^2+a^2))`, then `(d^2y)/(dx^2)` is equal to

A

`1/((x^2+a^2)^(3/2))`

B

`x/((x^2+a^2)^(3/2))`

C

`-1/((x^2+a^2)^(3/2))`

D

`-x/((x^2+a^2)^(3/2))`.

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