If , then, at = ?

- (A) -1
- (B) 1
- (C) 0
- (D)
- (E)

I think I made a mistake somewhere in my working. Here's what I did:

Using implicit differentiation:

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- Nov 8th 2009, 12:41 PMStarlitxSunshineDerivative of a Function at a point
If , then, at = ?

- (A) -1
- (B) 1
- (C) 0
- (D)
- (E)

I think I made a mistake somewhere in my working. Here's what I did:

Using implicit differentiation:

- Nov 8th 2009, 12:48 PMadkinsjr
I think you did the implicit differentiation wrong. Here's what I obtained:

Substitute these values in the expression above:

So now we have:

Try solving for and see if you can get an answer. - Nov 8th 2009, 12:59 PMVonNemo19
- Nov 8th 2009, 01:08 PMStarlitxSunshine
Yup Yup :3

Then the answer is -1

&& I see what I did wrong, too. I didn't take the derivative properly when I did product rule :33

Thank you very much ! =)