Edexcel C2 20th May 2015 *Official Thread*

What equation have you formed for volume and hence rearranged for l ?


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250=0.5X^2L

L= 500/x^2

How is the area of the triangular cross section 0.5x^2, something is missing


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what is missing? 1/2ab for the area of triangle

Guys I need help, can somebody link me a video or anything for the binomial expansion where the power is n
(2-3x)^n for example, It's never come up but I've got a good feeling it will this time

How do I get a A in c2? And who thinks logs will come up this year? Apparently they only come up sometimes in a paper


Posted from TSR Mobile

How do I get a A in c2? And who thinks logs will come up this year? Apparently they only come up sometimes in a paper


Posted from TSR Mobile

How do I get a A in c2? And who thinks logs will come up this year? Apparently they only come up sometimes in a paper
Posted from TSR Mobile

OMG I THINK I UNDERSTAND LOGS NOW

yeah i find all the caste diagrams a bit confusing but they're good for understanding, the following method works all the time for me:

tan = add 180 to principal value, then keep adding 180 for required range
cos = 360+principal value, 360-principal value, 720+ p.v., 720-p.v. etc same for negative ranges (-360 - p.v, -360+p.v)
sin = 180-p.v., 360+p.v., 540-p.v., 720+p.v.

can try these with any trig question throughout the whole alevel course and they always work, but many people have their own methods and just stick to that.

hope this helps

what does: logeX=3 equal?

Thankyou!

When do you know you have to add/ subtract on trignometric identities?

I'm feeling confident that there will be a log equation in the paper because last year they did not have one - they only had one to do with working out the value of the power x. So minimal log was knowledge was tested.

Plus they have not tested changing the base in a long time so that might be on it.
I have a feeling it will be a long 5/6 mark long question where many things will have to be tackled which I know will throw many people. Personally I think logs are the easiest topics so I'm hoping for it (not so much secretly now) Especially because others struggle with it so it lowers G.B . Banter.

But if anyone does not understand logs then it would be my pleasure to help them