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If y=x+e^x, then (d^2x)/(dy^2) is (a) ...

If `y=x+e^x,` then `(d^2x)/(dy^2)` is

(a) `e^x`

(b) `- e^x/((1+e^x)^3)`

(c) `-e^x/((1+e^x)^2)`

(d) `(-1)/((1+e^x)^3)`

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