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    Hi,

    What proofs do I need to know for C1, C2 and S1?
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     S_n = \frac{n}{2} = [2a + (n-1)d]

     S_n = \frac{a(r^n - 1)}{r-1}

    Show that trig problems

    Not sure for S1
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    (Original post by rampallian)
    Hi,

    What proofs do I need to know for C1, C2 and S1?
    You're not meant to know proofs... you're meant to be able to come up with them in the exam. Not memorise the requisite ones beforehand.
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    (Original post by Zacken)
    You're not meant to know proofs... you're meant to be able to come up with them in the exam. Not memorise the requisite ones beforehand.
    It is true but you are of NO help to OP who is trying to learn.
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    Although it is not beneficial to learn all the proofs, doing many beforehand is a surefire way to improving. OP, there are some above you should try.
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    Thanks for the suggestions


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