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# Edexcel A2 C3 Mathematics 12th June 2015 watch

https://07a69ccf283966549a9350d1a669...%20Edexcel.pdf

For 10c, I got to the stage 1/sinx - 3cosx = 0 not sure where to go from there???
Divide by cosx
2. (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?
3. (Original post by theoeht)
What other information was given in the question
it said "you stupid"
https://07a69ccf283966549a9350d1a669...%20Edexcel.pdf

For 10c, I got to the stage 1/sinx - 3cosx = 0 not sure where to go from there???
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
5. 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
6. (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.
7. (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://07a69ccf283966549a9350d1a669...%20Edexcel.pdf 13b and d?
8. (Original post by danlocke)
Why is point C (π-α ,0) when surely it should be (2π-α ,0)? (Elmwood B).

Anyone?
9. 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 😂
Oh of course thanks!! Do you mind helping me with https://07a69ccf283966549a9350d1a669...%20Edexcel.pdf 13b and d?
Sure, what did you get for part a to save me doing it too?
11. Why do the international papers feel so different to the UK ones for edexcel?
12. (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
13. (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
14. guys do you know if we need to know about factor formulae?

like SINP +SINQ = 2SIN(P+Q/2) COS(P-Q/2)
15. (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

Posted from TSR Mobile
16. (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
17. how would you know how to sketch -2-e^4x
18. (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.
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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