Edexcel A2 C3 Mathematics 12th June 2015 Watch

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physicsmaths
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#421
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#421
(Original post by Efemena15)
Ah yeah I just tried it. So you plug in actual values of x given. Ok thanks again
Yes as they are points lying on f(x) hence satisfy the equation.
No problem, anytime.


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lam12
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#422
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#422
I don't really know the half angle? Does anybody have any examples of questions it has been used in


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frozo123
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#423
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#423
(Original post by lam12)
I don't really know the half angle? Does anybody have any examples of questions it has been used in


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90 divided by 2 equals 45 degrees
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BBeyond
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#424
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#424
(Original post by frozo123)
90 divided by 2 equals 45 degrees
do you just enjoy going around being a **** or what?
Andy98
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(Original post by lam12)
Attachment 382253

Could somebody explain (d) for me?


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Substitute 0 in - that's one boundary
Substitute 5 in - that's the other

Plonk in an inequality with y in the middle, as well as:- y belongs to the set of real values (like they did with x)


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MathMeister
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dw i thought it was funny

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frozo123
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#427
(Original post by MathMeister)
dw i thought it was funny

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what my post?
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frozo123
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#428
(Original post by lam12)
I don't really know the half angle? Does anybody have any examples of questions it has been used in


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Okay so you use the double angle formulae and manipulate them in order to get half angles...
so?? sin2x= 2sinxcosx
then you do let 2x=y or something
so x=y/2
therefore you could put it into the equation like siny=2siny/2cosy/2
you do the same for cos2x
which equals 3 different identities ( well technically the same)
hope that helps?

try doing this identity I just did it a couple hours ago

sinx/1+cosx=tanx/2
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MathMeister
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#429
(Original post by frozo123)
what my post?
yh
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samb1234
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#430
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#430
(Original post by frozo123)
Okay so you use the double angle formulae and manipulate them in order to get half angles...
so?? sin2x= 2sinxcosx
then you do let 2x=y or something
so x=y/2
therefore you could put it into the equation like siny=2siny/2cosy/2
you do the same for cos2x
which equals 3 different identities ( well technically the same)
hope that helps?

try doing this identity I just did it a couple hours ago

sinx/1+cosx=tanx/2
Yeah its not too hard to derive double or half angle formulas so I don't really bother learning them

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frozo123
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#431
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#431
(Original post by MathMeister)
yh
the guy below me can't take banter
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lam12
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#432
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#432
(Original post by frozo123)
Okay so you use the double angle formulae and manipulate them in order to get half angles...
so?? sin2x= 2sinxcosx
then you do let 2x=y or something
so x=y/2
therefore you could put it into the equation like siny=2siny/2cosy/2
you do the same for cos2x
which equals 3 different identities ( well technically the same)
hope that helps?

try doing this identity I just did it a couple hours ago

sinx/1+cosx=tanx/2
Attachment 386531

Ah it's because I saw these and was like what haha, it's literally just rearranging but I've never really seen them used so I dunno!


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BBeyond
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#433
(Original post by frozo123)
the guy below me can't take banter
yh man sick banter
adorablegirl1202
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what is the best thing to do right now in terms of prep? Solomon papers and the last few years worth of past papers? Really need that a*
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rory58824
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#435
(Original post by adorablegirl1202)
what is the best thing to do right now in terms of prep? Solomon papers and the last few years worth of past papers? Really need that a*
That's what I'm doing, best thing to do in revision for maths.
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ridirahman
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#436
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#436
Can someone expain range and domain to me please? I don't get any questions on stating the range or domain from a graph.. like it's sooo confusing and the type of questions that come up are always different? Is there a specific way of doing the questions? Like a rule or something becaus I'm just lost:confused:
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studentwiz
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#437
https://07a69ccf283966549a9350d1a669...%20Edexcel.pdf

can someone explain to me how to do question 9) part b and c please
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bbadonde2
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#438
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#438
(Original post by ridirahman)
Can someone expain range and domain to me please? I don't get any questions on stating the range or domain from a graph.. like it's sooo confusing and the type of questions that come up are always different? Is there a specific way of doing the questions? Like a rule or something becaus I'm just lost:confused:
Domain is the range of x values that you can pit into a function f(x). E,g, if you're function if f(x) = 1/(x-2) then your domain may be x<2.
The range is the range of y values that you get out of your function f(x) and it corresponds to the range. Say if the range for f(x) = 2x + 1 was 2<x<4 then your range would be 5<f(x)<9.
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Kevin De Bruyne
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#439
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#439
(Original post by studentwiz)
https://07a69ccf283966549a9350d1a669...%20Edexcel.pdf

can someone explain to me how to do question 9) part b and c please
It's a typical 'use the R formula from part (a) and find the min/max', but they've added a few twists. Can you see what the maximum would be?
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Itsmonique
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#440
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#440
I have a C3 test on Tuesday. I'm constantly getting a B in C3 so far (58/75). I really want an A in c3 so bad. I'm not sure whether I should do all the solomon papers first and the. The actual past papers or do that the thee way round.


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