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

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

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