Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    2
    ReputationRep:
    June 2014 FP2 (R) question 8:

    For the second differentiation, they have multiplied the differentiation by dy/dz on both sides. I have no idea why they have done that. My differentiation is the same but without the additional dz/dx on both sides.

    Clear image if you don't know what I mean:
    http://i.gyazo.com/f005e347bf6a9a23da4b12114766a2a4.png

    I have a fp2 mock tomorrow and this question is killing me!
    Offline

    14
    ReputationRep:
    (Original post by newguy101)
    June 2014 FP2 (R) question 8:

    For the second differentiation, they have multiplied the differentiation by dy/dz on both sides. I have no idea why they have done that. My differentiation is the same but without the additional dz/dx on both sides.

    Clear image if you don't know what I mean:
    http://i.gyazo.com/f005e347bf6a9a23da4b12114766a2a4.png

    I have a fp2 mock tomorrow and this question is killing me!
    Chain rule (or implicit differentiation, whichever you want to call it).

    You are differentiating dy/dx with respect to x but the things on the RHS are in term of z, so you have to compensate by multiplying by dz/dx
 
 
 
Poll
Who is your favourite TV detective?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.