Edexcel A2 Mathematics: Core Mathematics C4 6666 01 - 22 June 2018 [Exam Discussion]

How do you do part B

when you solve differential equations, and you have a constant on one side. if you want to multiply both sides of the equation by a value, do you also multiply the constant by that value.

when you solve differential equations, and you have a constant on one side. if you want to multiply both sides of the equation by a value, do you also multiply the constant by that value.

Same! I’m doing the exam solutions exam questions by topic then imma smash about 10 past papers

we may need to derive the derivative of arctan but i dont think we need to know either off by heart

Please can someone help with this with steps, after bio, Chem and C3 this week my brain doesn’t want to work anymore

Find the coefficient of x^2 in the expansion of (1-x-x^2)^0.5

I believe the method is to factorise the function and then split the terms so you get (1+x)^0.5(1-2x)^0.5
Then expand each separately and multiply the expansions

can someone please explain how you go from step 1 to step 2, thanks

can someone please explain how you go from step 1 to step 2, thanks

as in differentiate tan^-1 (x) ?

But those brackets give you 1-x-2x^2 which is not what is under the root..... that’s where I’m stuck.

Sorry, mis-read on my part. What paper is it from?

No worries..... it’s from the chapter review on binomial series C4 in my Edexcel textbook

Answer is

ive seen it in a paper somewhere I think(may have been a solomon) but I really doubt it will come up.

It is similair to the question in C3 with the derivative of x=e^siny.

except you have to put tany = x find dx/dy then using tan^2 +1=sec^2 rearrange to find in terms of x