Edexcel FP2 Official 2016 Exam Thread - 8th June 2016

For de moivre's theorem, do we need to know the proof for both positive and negative integers? I mean positive i can manage it's just proof by induction by negative is just like extraaa...

Hi does anyone know whether substitutions like these could be on FP2? http://madasmaths.com/archive/maths_booklets/further_topics/integration/1st_order_differential_equations_substitutions.pdf I don't think I've seen anything similar in past papers, but not too sure! Thanks

Well yeh transforming de's to solvable de's can come up, but they will give you a sub so all you need to do is substitute it which is easy.
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Question 6a in the june 2009 paper: in the MS - the first step they do in the fancy brackets, I dont get what we're doing to change |wi| to |w|? where does the i go?


https://8dedc505ac3fba908c50836f59059ccce5cd0f1e.googledrive.com/host/0B1ZiqBksUHNYdHIxUkJmdndfMlE/June%202009%20MS%20-%20FP2%20Edexcel.pdf

How is FP2 going for everyone?

Please could explain question 52b please, I understand up to finding the value of cos squared theta but I don't understand the last line of the mark scheme! Thanks

It's just saying that cos (3pi/10) is smaller than cos (pi/10) so cos(3pi/10) is the smaller root (5-sqrt(5)) instead of being the bigger root (5 + sqrt(5)).

Got a mock tomorrow and have only briefly looked at the first 5 chapters. Pray 4 me

Got a mock tomorrow and have only briefly looked at the first 5 chapters. Pray 4 me

Can someone explain this to me please?

The first step is to find z in terms of w. They have then expanded z into z = x + iy and w into w = u + iv. Next, they multiplied both sides by (1 - u + iv)/(1 - u + iv) to get rid of any imaginary numbers on the bottom, and then split the resulting fraction into real and imaginary parts.

The question asks for y = 2x, so they equated the imaginary part of this (taking out i) with 2 lots of the real part of this. The denominators cancelled and the resulting algebra worked to give the equation of the circle.

If you want me to go into more detail on a certain stage just say. In the exam, they would usually ask you a question which requires this method (where the algebra is usually more complicated) which requires you expanding z, or will give you a modulus of z substitution where you make z the subject and take the modulus of both sides (this is far more common and easy). Some questions may be worded slightly weirdly though, so you may need to use your initiative to answer them, but they're usually show questions.

hi guys. Im really struggling on transformation questions (chapter 3). I barely get any questions correct. When I attempt them I sometimes get stuck in the middle and dont know what to do to solve them. Any help???