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# FP2 Second order Differential Question help! Urgent! watch

1. 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!
2. (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

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