# Edexcel A2 C3 Mathematics 12th June 2015Watch

This discussion is closed.
3 years ago
#1281
(Original post by theoeht)
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?
Thinking about it seen as it's only two marks there must be an easier method but I can't see it at the moment
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3 years ago
#1282
Hey guys, just wondering:

For the questions where it says express XsinP+YcosQ as Rcos(x+a) - or anything similar to that ie cos-sin etc), whats the best way of remembering what tan a is? I always get confused as to whether its P over Q, or Q over P etc!
Hope my question makes sense and hopefully someone has a simple way of remembering!
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3 years ago
#1283
Can't be asked to revise right now. I have an open book and a pen in hand and I have written
sin2A=2sinAcosA in the last 2 hours.
1
3 years ago
#1284
Oh of course thanks!! Do you mind helping me with https://07a69ccf283966549a9350d1a669...%20Edexcel.pdf 13b and d?
And for part d draw a vertical line down from the top corner of any of the rectangles making a right angle triangle with the angle as theta the opposite as 4 and the hypotenuse as 8-h as you have found theta : 4/sin(theta)= 8-h and then just rearrange that
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3 years ago
#1285
(Original post by suyoof123)
It comes in the formula book iirc.
yeah seen it but i was just asking because i have never used it in a single edexcel paper lol
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3 years ago
#1286
(Original post by Ripper Phoenix)
yeah seen it but i was just asking because i have never used it in a single edexcel paper lol
Have you done all the edexcel past papers? and if they havnt come up, so glad!
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3 years ago
#1287
(Original post by suyoof123)
Have you done all the edexcel past papers? and if they havnt come up, so glad!
lol no, it may have come up but i may have used a different method
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3 years ago
#1288
(Original post by Ripper Phoenix)
lol no, it may have come up but i may have used a different method
Thats good ^^, already cramming the basics in and if that stuff comes up

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3 years ago
#1289
http://tinypic.com/r/2qjx93a/8

That's what i got...
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#1290
Time to start revision. I hope they're aren't more than 2 trig questions
1
3 years ago
#1291
(Original post by Kill3er)
Time to start revision. I hope they're aren't more than 2 trig questions

I don't want to prove any trig identities, they piss me off
0
3 years ago
#1292
(Original post by Kill3er)
Time to start revision. I hope they're aren't more than 2 trig questions
What do you mean by 'trig questions'? There could be 5 or 6 questions involving trig
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3 years ago
#1293
Is knowing if functions are many-to-one or whatever in the syllabus?
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3 years ago
#1294
C3 June 2014 paper Q5b, I don't get how you find the range? Then again I ALWAYS get the range questions wrong, can someone help me please? Greatly appreciated, thanks c:
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3 years ago
#1295
(Original post by iceangel8)
Is knowing if functions are many-to-one or whatever in the syllabus?
There have been questions asking why the function doesn't have an inverse. Then you'd have to say it's many to one mapping and not one to one. They're usually one mark though so not to worry c:
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3 years ago
#1296
Hi anyone got a link to tutorials on turning points and maximum, I dont mean worked exam solutions but maybe something that explains the concept.
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3 years ago
#1297
https://b3755649dbd1afe3db91a899c3b9...%20Edexcel.pdf

2b? how do I simplify the y coordinate wtf
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3 years ago
#1298
How do you know when to use the chain rule/product rule/quotient rule??? Sometimes I can't tell which one?
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3 years ago
#1299
When were using ln(x) do we have to put ln|x| as in ln modulus of x because our maths teachers getting stressy saying we have to otherwise we lose marks
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3 years ago
#1300
When solving for x

eg. tanxcos2x=2cos2x
tanxcos2x-2cos2x=0

do u factorise cos2x out: cos2x(tanx−2)=0

or do you cancel cos2x out: tanx-2=0 to then get tanx=2

0
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