Second order derivative of (log x-x) is
as
logxx = 1
So
"\\cfrac{d^2}{dx^2} ( log_x x)= \\cfrac{d}{dx}[\\cfrac{d}{dx} (log_x x)]"
Also,
"\\cfrac{d}{dx}[\\cfrac{d}{dx} (log_x x)]= \\cfrac{d}{dx}[\\cfrac{d}{dx} ( 1)] = 0"
And hence the answer is 0
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