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# Fast Maths people - new Edexcel syllabus C3 and C4! watch

1. Argh, they are so damn hard. Can someone explain the Chain Rule to me? I keep mucking it up.
2. i'll give it a crack..

say:
y=(1+2x)3

say
u=1+2x
therefore
du/dx=2

y=(1+2x)3
y=u3
dy/du=3u2

the chain rule is:
dy/dx=dy/du*du/dx (basically du terms cancel)
dy/dx=(3u2*2)
dy/dx=3*2(1+2x)2
dy/dx=6(1+2x)2

i'm not sure how clear that was.. hope it helps
3. Multiply the bracket by the power the bracket is raised to, then decrement the power by 1, then differentiate the contents of the bracket and multiply the differential by the bracket:

(2x2+2)5
:. dy/dx = 5*4x(2x2+2)4
= 20x(2x2+2)4

... I hope.
4. I think they help.

meh...

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