Second derivative of x with respect to y (d2x/dy2)

1. A.
   $36$
2. B.
   $9$
3. C.
   $6$
4. D.
   $4$

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1. A.
   $\dfrac{e^x}{(1 + e^x)^2}$
2. B.
   $\dfrac{-e^x}{(1 + e^x)^2}$
3. C.
   $\dfrac{e^x}{(1 + e^x)^3}$
4. D.
   $\dfrac{-e^x}{(1 + e^x)^3}$

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1. A.
   $1$
2. B.
   $2$
3. C.
   $6$
4. D.
   $5$

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1. A.
   $x\dfrac{d^2x}{dy^2} + a = 0$
2. B.
   $2a\dfrac{d^2x}{dy^2} - 1 = 0$
3. C.
   $\dfrac{d^2x}{dy^2} - 2a = 0$
4. D.
   $\dfrac{d^2x}{dy^2} - 1 = 0$

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1. A.
   $-\dfrac{e^x}{(1 - e^x)^3}$
2. B.
   $\dfrac{e^x}{(e^x - 1)^3}$
3. C.
   $\dfrac{1}{(1 - e^x)^3}$
4. D.
   $\dfrac{e^x}{(1 - e^x)^3}$

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