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# Edexcel A2 C3 Mathematics 12th June 2015 watch

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1. If you have a fraction, can you divide every term in that fraction by the same thing?
2. (Original post by frozo123)
complete the square.
Omg thanks! I was scratching my head ahah
3. Can we only use exact values for sin/cos30 and sin/cos45, or can we use 60 too?
4. (Original post by TheAnnabelle)
Omg thanks! I was scratching my head ahah
5. Guys, do you have any tips about domain/range?

i ALWAYS seem to struggle to get those 2/3 marks
6. (Original post by Nirm)
Can anyone tell me if this is correct or not?
So say the angle is 30 degrees and you found that out using arcsin.
And if question asked to find values from -180<x<180
(Using the CAST/Quadrant method)
Would the solutions/values be : 30,150,-30,-150?
its only 30 and 150
7. (Original post by adorablegirl1202)
I need help with c3 jan 2007 7d
-find the gradient from the equation they've given you
-differentiate f(x)
-set that equal to the gradient
8. (Original post by Humbers)
You cant really find the domain from a graph in this case, you'd need to know to use common sense that ln(x+2) x+2 cannot be zero as ln0 is undefined

Attachment 425693
why is the answer 4>= y ? I thought y>=4.. I'm so confused

https://3fbd0e46fbbe11b4c200b26409e8...tions%20Qs.pdf
9. Had a look at these. Kinda useless.
10. (Original post by Pineappleheadish)
Which year and month has the hardest C3 paper please
June 2013 probably https://07a69ccf283966549a9350d1a669...%20Edexcel.pdf
11. (Original post by TheAnnabelle)
Guys, do you have any tips about domain/range?

i ALWAYS seem to struggle to get those 2/3 marks
e^x > 0. Remember that as a stock one. And e^x^2 >= 1.
If you can, use a graph for reference.
If it's some kind of fraction, there may well be two limits (e.g. 1 < f(x) < 4). You can probably find the first limit by setting equal to 0 and the second one by just increasing x and seeing what it tends to.
12. (Original post by Jimmy_M)
Can we only use exact values for sin/cos30 and sin/cos45, or can we use 60 too?
We can use 60 too. What makes you think we couldn't?
13. (Original post by TheAnnabelle)
Guys, do you have any tips about domain/range?

i ALWAYS seem to struggle to get those 2/3 marks
same here
14. (Original post by Graph)
We can use 60 too. What makes you think we couldn't?
I assumed so, especially considering sin30 = cos60.. Some revision notes I read said 30 and 45, didn't mention 60.. Thank you!
15. If a question firsts asks for you to state a harmonic form with the alpha or whatever it is rounded, am I still then okay to instead use the exact value of alpha for the rest of the questions, as they never seem to say "using your answer to (a)" or whatever so I'd otherwise feel at risk of getting some answers slightly wrong because of the rounding...
16. https://b3755649dbd1afe3db91a899c3b9...%20Edexcel.pdf

6a? *sigh *
17. turn it into sin cos then simplify and add the fractions when needed to get a single fraction. you will get cot if you do it correctly.
18. (Original post by ThatGuyRik)
Had a look at these. Kinda useless.
Why do you think that? Personally i think they are a great resource
19. (Original post by studentwiz)
thats so neat and clear, do you do that in the exam?
Hahahah for the first few questions then it starts getting messy lol
20. Hi, can anyone help me with the maximums and minimums of graphs? The particular question I'm struggling on in q4 on jan 2013 paper

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