http://img145.imageshack.us/img145/4817/057bp9.png

http://img145.imageshack.us/img145/2858/058fe7.png

What did I do wrong?

Thanks,

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- May 5th 2008, 09:13 AMr_mathsImplicit Differentiation (iii)
http://img145.imageshack.us/img145/4817/057bp9.png

http://img145.imageshack.us/img145/2858/058fe7.png

What did I do wrong?

Thanks, - May 5th 2008, 10:03 AMgalactus
The first derivative is correct

Now, continue from there by taking the derivative of that. BUT, do not forget to sub in what dy/dx equals. That is where many go astray.

Quotient rule:

Sub in dy/dx from above:

They just used a common denominator and rewrote it. That is the same thing. - May 5th 2008, 10:18 AMSoroban
Hello, r_maths!

Quote:

First

Second

Then: .

. . . .

. . . .

- May 5th 2008, 10:29 AMr_maths
- May 5th 2008, 10:47 AMr_maths
- May 5th 2008, 11:54 AMMoo
- May 5th 2008, 12:14 PMr_maths
- May 5th 2008, 12:35 PMMoo