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Edexcel C2

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If anybody have some real difficult C2 questions please post it here so that everybody can practice them. Thank You.
 
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what formulas we need to memorize for differentation?
No special formula is required for differentiation. You just need to know how to differentiate. In C2, second derivative of y is required. Its just the same. The equation of first derivative, is further differentiate. And you just need to solve some questions regarding it.
 
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Having any doubts, problems or difficult questions? Just ask here!
I have a doubt!!! For example in june 2012 Q4, can I use Ruffini to factorise f(x)? And where it says use factor theorem can I do Ruffini and show that the reminder is 0? please help me quixk, the exam is tomorrow!! =)
 
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