The whole problem, I cannot differentiate it.

bobbym wrote:

Hi;

There is no such word as can't - pappym

Let's do it again.

Where do we start?

Could you not write it all out how you broke down each term and differentiated and show me so I can just try myself?

My exam is on January 8th and I don't have time

bobbym wrote:

Could you not write it all out how you broke down each term and differentiated and show me so I can just try myself?

My exam is on January 8th and I don't have time

I have already done that. Reminds me of the movie,

Sollozo: Get in the car!

Hagen: I do not have time for this...

Sollozo: Make time consigliori!

Unless you do it, you will not learn it. The 8th is many days away. The Japanese would say it is an eternity. Many things can happen till then.

You seemed to have got it before, did you forget how?

Hehehe! Thank you for your patience
I know but in terms of the module it is obviously 3 lines of one out of 22 lectures which has much more stuff that I cannot cover
I didn't forget anything from last time, just we nearly differentiated one of the terms.

We found two of them =0. The third one we spent some time on, we got a result, then we have to put it over 'P' but I don't know why. And the last one we haven't yet begun.

Ok, yes, that is -nPi^(-n-1).

So how does that term look (the one we just differentiated?)

Is it:

(nWYPi^(-n-1))/PP^(-n) = (nWYPi^(-n-1))/P^(-n+1)??

where? can you post it?

Hi bobbym

It looks like that is what he/she got...

bobbym wrote:

Hi;

Since we are differentiating with respect to Pi, everything else is a constant.

Can you differentiate what is boxed off with respect to Pi?

Bobby, with all due respect, you are making this very difficult for me.

My answer to this question, which I just posted, you said I was missing a minus sign...then you posted your most recent answer, which completely contradicts what I said (so I must be wrong on the previous differentiation).

I need someone to break it down for me and show that the answer I provided at the beginning is correct. If you cannot do that, please stop trying to make me 'see the light' as it were, with all due respect, because I am getting frustrated that we are not communicating well enough and all this is doing it leading to confusion. If you are choosing not to help me, please do not reply.

But the third term is still undone and I keep thinking that I am doing it correctly and then writing it up neat just for you to post something completely different so I get the feeling you are purposely doing this.

bobbym wrote:

Hi;

You should end up with this.

bobbym wrote:

Hi;

Since we are differentiating with respect to Pi, everything else is a constant.

Can you differentiate what is boxed off with respect to Pi?

So these two things, are they not different? Which is correct? I showed what I got by differentiating the bottom and wrote it out, it does not equal the thing you posted

bobbym wrote:

They are different for a reason. One is differentiated the other is not.  One is the question and the other one is the answer.

Your answer is also not simplified. In the beginning of this you differentiated it okay but then could not simplify it.

I will tell you what I will do. I will leave your thread open and someone else will help you.

You see how unhelpful you are being?

You TOLD me to differentiate the thing I just posted, I did it, I cannot simplify it, that is the whole point of this entire thread. I cannot simplify things, instead of helping me, you just tell me things like 'one is differentiated the other is not'. Thanks for all your help...I used to think you were a really good teacher. Not all students are the same so you must adapt your methods. Best wishes then.