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# what proofs do I need to know for ASLevel Watch

1. hey guys what are the proof I need to know for
a) C1

and

b) C2?

Thanks so much
2. (Original post by upthegunners)
hey guys what are the proof I need to know for
a) C1

and

b) C2?

Thanks so much
What board
3. (Original post by TenOfThem)
What board
CCEA

It does not mention any proof but It a Log base rule proof was asked in an exam question and also a Trig Identity proof
4. (Original post by upthegunners)
hey guys what are the proof I need to know for
a) C1

and

b) C2?

Thanks so much
Edexcel for C1, proof of the sum of an arithmetic series
Edexcel for C2, proof of the sum of geometric series

Edit nvm, but I suppose these may come up?
5. (Original post by Robbie242)
Edexcel for C1, proof of the sum of an arithmetic series
Edexcel for C2, proof of the sum of geometric series

Edit nvm, but I suppose these may come up?
I didn't realise I needed to know the latter proof thanks!
6. (Original post by reubenkinara)
I didn't realise I needed to know the latter proof thanks!
Although it came up in the June 2012 paper, so I doubt it will come up again. It would still be good to learn it though.
7. (Original post by brittanna)
Although it came up in the June 2012 paper, so I doubt it will come up again. It would still be good to learn it though.
Thanks. I know most of my proofs although there are a few I've forgotten.
Like why
8. (Original post by reubenkinara)
Thanks. I know most of my proofs although there are a few I've forgotten.
Like why
For , you just need to use the chain rule, letting u=f(x). For the e^x one, I think you could just say:

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