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# Edexcel Core 3 - 21st June 2016 AM watch

1. (Original post by mathsmo19)

4) 273.9,33
Wasn't it 274.9? Or am I remembering it wrong
2. (Original post by nishofficial)
How did you prove it was cotx?
As far as I remember, in the end you get (1-sin^2x)/sinxcosx = cos^x/sinxcosx = cotx
3. the questions for all the 'easy' topics weren't all that easy this time like even that fraction question was tricky (q7?)

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4. there is a sign change, you needed to create a new function f(x) that was g(x) take away the equation of the second line
5. What a shitshow
6. How did every express 2 cos theta - sin theta in the form R cos (theta + a) ?
7. mixed feelings about that one, don't think I will have got the A that I needed
8. What the **** was that?!! Lmao
9. (Original post by nishofficial)
How did you prove it was cotx?
Change tan and cots into sin and cos
10. LOVED IT! (except for some dodgy bits in the last question) will arsey be doing model answers this year?
11. (Original post by timelizard)
goodbye to that A* I had hoped for
sameeee
12. (Original post by Dark knight123)
They never have done 3 marks difference between grade C and B always been six or seven.
You're right, corrected now.
13. why was there a question about partial fractions lol
14. I didn't even complete some questions worst paper I've ever done for sure!!
15. (Original post by mpwb12345)
How did every express 2 cos theta - sin theta in the form R cos (theta + a) ?
R=root5
Theta = 26.57
16. I can happily kiss goodbye to my uni offer hardest paper I've ever seen didn't do like 20 marks (((

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17. (Original post by mpwb12345)
How did every express 2 cos theta - sin theta in the form R cos (theta + a) ?
Was root 5 and 26.somethon
18. this is the correct method
19. The last question was almost an exact repeat of one that's been up before, otherwise I wouldn't have been able to do it lol
20. (Original post by nishofficial)
How did you prove it was cotx?
I used the cos^2(x)-sin^2(x) identity for cos2x, then used a common denominator of 2sin^2(x)cos(x), it all ended up collapsing in itself to get cosx/sinx

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