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If x=log t, t gt 0 and y=1/t, then (d^(2...

If `x=log t`, `t gt 0` and `y=1/t`, then `(d^(2)y)/(dx^(2))`, is

A

`dy/dx`

B

`- dy/dx`

C

`y`

D

`y/x`.

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