Edexcel A2 C3 Mathematics 12th June 2015Watch

This discussion is closed.
4 years ago
#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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4 years ago
#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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0
4 years ago
#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
2
4 years ago
#424
(Original post by frozo123)
90 divided by 2 equals 45 degrees
do you just enjoy going around being a **** or what?
4 years ago
#425
(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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0
4 years ago
#426
dw i thought it was funny

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4 years ago
#427
(Original post by MathMeister)
dw i thought it was funny

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what my post?
0
4 years ago
#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
0
4 years ago
#429
(Original post by frozo123)
what my post?
yh
0
4 years ago
#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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0
4 years ago
#431
(Original post by MathMeister)
yh
the guy below me can't take banter
1
4 years ago
#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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4 years ago
#433
(Original post by frozo123)
the guy below me can't take banter
yh man sick banter
3 years ago
#434
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*
0
3 years ago
#435
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.
0
3 years ago
#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
0
3 years ago
#437
https://07a69ccf283966549a9350d1a669...%20Edexcel.pdf

can someone explain to me how to do question 9) part b and c please
0
3 years ago
#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
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.
0
3 years ago
#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?
0
3 years ago
#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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