# Edexcel A2 C3 Mathematics 12th June 2015Watch

This discussion is closed.
3 years ago
#1941
(Original post by jf1994)
Do we need to know cos(-x) = cos(x) and sin(-x) = -sin(x)?
say whaaatttt
0
3 years ago
#1942
(Original post by frankthebunny)
Guys what are the tips tricks and **** like that for tomorrow im ****tng myself
Don't **** up
3
3 years ago
#1943
(Original post by suyoof123)
Thanks!

didnt know that but we still have to learn those weird graphs.
It is probably best to learn the graphs but if you really get stuck I would leave it until you've done the rest of the paper and then go back and plot the graph using your calculator so you don't waste time. Good luck tomorrow!
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3 years ago
#1944
(Original post by lightningdoritos)
Just had another go at it, not sure what you would do after putting the discriminant to <0 because surely you would have to square root a negative value?
No you put the discriminant = 0.
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3 years ago
#1945
(Original post by mb_12)
It is probably best to learn the graphs but if you really get stuck I would leave it until you've done the rest of the paper and then go back and plot the graph using your calculator so you don't waste time. Good luck tomorrow!
Thanks bro, Good luck to you too .

But thanks to your hint before, all you have to do is draw sin,cos,tan graphs and reflect on y=x

I'll still memorise them, in the heat of the moment, i might forget how to mirror graphs...
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3 years ago
#1946
(Original post by ojj_12)
Can anyone help with transformations and things with ln graphs and the asymptotes things. I cannot draw anything! I never got more than a 2b in art
For transformations I used this site http://astarmathsandphysics.com/a-le...of-graphs.html

Essentially, if there is something inside the bracket i.e f(x+2) it does what you wouldn't expect it to do, to the x value - therefore x decreases by 2. Same with f(2x), it would half the x value. Outside the bracket does the opposite, inverse function reflects it in y=x
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3 years ago
#1947
Could someone help me with question 4b? Never seen this question come up before.
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3 years ago
#1948
(Original post by SeanFM)
Differential of sin.
https://07a69ccf283966549a9350d1a669...%20Edexcel.pdf

sean 5b?

I got 1/ ( 6x^2(x^2-1)^1/2 )
how do I go from there?
0
3 years ago
#1949
Just wanted to say, hope everyone is heading off to sleep soon. Sleep is key before an exam.
I want to wish everyone the best of luck and hope you all do to the best of your ability tomorrow. Just not too good, I don't want mega high grade boundaries

GOOD LUCK!
0
3 years ago
#1950
if a paper like june 13 come up tomorrow, i would jump out the window
0
3 years ago
#1951
(Original post by Tiwa)
Could someone help me with question 4b? Never seen this question come up before.
What paper is that? I've never even heard of proof by contradiction
0
3 years ago
#1952
(Original post by LukeTownsend123)
Just wanted to say, hope everyone is heading off to sleep soon. Sleep is key before an exam.
I want to wish everyone the best of luck and hope you all do to the best of your ability tomorrow. Just not too good, I don't want mega high grade boundaries

GOOD LUCK!
nice hairline
1
3 years ago
#1953
(Original post by Gome44)
I haven't done this question but I'm fairly certain you don't have to use the discriminant. Could be wrong though
Well I started finding the gradient of f(x) but then didn't know what to do after that....haha
0
3 years ago
#1954
(Original post by Tiwa)
Could someone help me with question 4b? Never seen this question come up before.
Assume it is rational, ie log2(3)=p/q q=/= 0

Get to a stage where 2^q = 3^p (or other way wrong, I can't remember), clearly not true as q=/=0

0
3 years ago
#1955
Any particularly tough papers anyone can recommend? (I've done all the Gold Edexcel papers, Solomon papers, Zig Zag papers, and S&T and U-V IYGB papers on madasmaths)
0
3 years ago
#1956
(Original post by Tiwa)
Could someone help me with question 4b? Never seen this question come up before.

you don't need to know it, don't stress
0
3 years ago
#1957
(Original post by Tiwa)
Could someone help me with question 4b? Never seen this question come up before.
I'd say 2^x=3 then attempt to solve for x, the question tells you something won't work when solving, but I don't know the specifics without doing it myself

Posted from TSR Mobile
0
3 years ago
#1958
(Original post by frozo123)
https://07a69ccf283966549a9350d1a669...%20Edexcel.pdf

sean 5b?

I got 1/ ( 6x^2(x^2-1)^1/2 )
how do I go from there?
have you looked at this https://07a69ccf283966549a9350d1a669...%20Edexcel.pdf
0
3 years ago
#1959
(Original post by Tiwa)
Could someone help me with question 4b? Never seen this question come up before.
0
3 years ago
#1960
(Original post by lightningdoritos)
Well I started finding the gradient of f(x) but then didn't know what to do after that....haha
As a is +ve, the tangent will be in the reflected part, so you need to find the gradient of -f(x). At a point, say z, the gradient of the tangent is the same as the gradient if the line. Sub in, rearrange, sub in some more and hopefully you get the answer
0
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