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Edexcel A2 C3 Mathematics 12th June 2015

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Original post by adorablegirl1202


Divide by cosx
Original post by anonwinner
Divide by cosx


I thought about doing that but I thought they said you shouldn't do that because you lose a solution?
Original post by theoeht
What other information was given in the question


it said "you stupid"
Original post by adorablegirl1202


Take 3cosx to the other side

Times both sides by sinx to get:

1 = 3sinxcosx

2sinxcosx = sin2x

therefore

1 = 3sinxcosx can be written as

2/3 = sin2x

arcsin(2/3)= 2x etc etc
(edited 8 years ago)
I have done all the Edexcel past papers for C3, Just wondering what papers people recommend to do next? International, elmwood or solomon press or bronze, silver and gold papers? Thanks
Original post by hajs
Oh really. I didnt know lol. So if you had to draw say f(x)= 2|x| +3 do you square it or ..?


Wouldnt that be a simple mod IxI graph, with y values two times bigger then you translate the graph 3 y units up.
Original post by theoeht
Take 3cosx to the other side

Times both sides by sinx to get:

1 = 3sinxcosx

2sinxcosx = sin2x

therefore

1 = 3sinxcosx can be written as

2/3 = sin2x

arcsi(2/3)= 2x etc etc

Oh of course thanks!! Do you mind helping me with https://07a69ccf283966549a9350d1a66951a7bc96e2dc.googledrive.com/host/0B1ZiqBksUHNYZ0JQM1NRcmdHdXM/June%202014%20(IAL)%20QP%20-%20C34%20Edexcel.pdf 13b and d?
Original post by danlocke
Why is point C (π-α ,0) when surely it should be (2π-α ,0)? (Elmwood B).





Anyone?
Im crapping it for tomorrow not sure what to do as i just make silly kistakes here and there and i really dont wanna stress about it otherwise ill lose it 😂
Original post by adorablegirl1202


Sure, what did you get for part a to save me doing it too?
Why do the international papers feel so different to the UK ones for edexcel?
Original post by theoeht
Sure, what did you get for part a to save me doing it too?


r = root 5 and theta = 26.6
Original post by anonwinner
Why do the international papers feel so different to the UK ones for edexcel?


they're c34 and international papers are slightly harder as well! Lots of competition for internationals dont forget
guys do you know if we need to know about factor formulae?


like SINP +SINQ = 2SIN(P+Q/2) COS(P-Q/2)
Original post by Ripper Phoenix
guys do you know if we need to know about factor formulae?


like SINP +SINQ = 2SIN(P+Q/2) COS(P-Q/2)


I've seen a few questions you could use them but they weren't necessary. They are all in the formula book anyway

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Original post by samb1234
i've seen a few questions you could use them but they weren't necessary. They are all in the formula book anyway

posted from tsr mobile


aight thanks :smile:
how would you know how to sketch -2-e^4x
https://b3755649dbd1afe3db91a899c3b9837b22326254.googledrive.com/host/0B1ZiqBksUHNYMG14YWtobVJUUms/for-Edexcel/Solomon%20H%20QP%20-%20C3%20Edexcel.pdf

4b anyone?
Original post by Ripper Phoenix
guys do you know if we need to know about factor formulae?


like SINP +SINQ = 2SIN(P+Q/2) COS(P-Q/2)


It comes in the formula book iirc.
Original post by adorablegirl1202
r = root 5 and theta = 26.6


For part B i've taken one of the rectangles and drawn a diagonal line down the middle, the angle is 90-(theta) and sin(90-(theta)) is 4/root20

so sin(90-(theta)) = 4root5/root20

root20 = 2root5

so sin(90-(theta)) = 2

If you get me?

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