# Edexcel A2 C3 Mathematics 12th June 2015Watch

This discussion is closed.
3 years ago
#1561
anyone got any hard trig questions to have a go at? Maybe inverse trig functions?
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3 years ago
#1562
(Original post by MATTTT)
How the FUDGE is part a (i) the graph of the inverse function? i thought the inverse function is a reflection in y=x line and i just can't see that with this graph in my head.
Is there a way in which you can just times the co-ordinates by something to find the reflection in the y=x line??? Someone please help!
It is a reflection in the line y=x

Put something reflective like a mirror or your phone with the screen turned off on the line y=x and you can see
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3 years ago
#1563
(Original post by MATTTT)
How THE FUDGE is part a (i) the graph of f^-1(x) ?

i thought to draw the inverse function you reflect the f(x) in the y=x line.
Rather than imagining it through the head, is it possible to just times the co-ordinates by something to find the reflection in the y=x line Because i do not understand how they got that in part a (i)

Someone help!
Because it's a reflection in the line y=x
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3 years ago
#1564
(Original post by Ripper Phoenix)
simple! cot 2x is the same as cos2x/sin2x.

So eventually cos2x=0 AND YOU SOLVE!! YOU WILL GET 90,270
Thankyou! I didn't even think to do that!
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3 years ago
#1565
(Original post by anonwinner)
Because it's a reflection in the line y=x
yh but how would you imagine that in an examine. like wtf? Explain to me how you would approach that if you didn't know the answer was that?

Where would you start?
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3 years ago
#1566
(Original post by SeanFM)
It's linked to part a. Sec(x+(pi/6)) is the same as 1/(cos(x+(pi/6)), so they've multiplied both sides by cos(x+(pi/6)) to get something of the form in part a.
Ok yeh i got that bit, then how do they get to cos(2x... bit from 2cos(x+pi/2)??
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3 years ago
#1567
(Original post by domcandrews)
Ok yeh i got that bit, then how do they get to cos(2x... bit from 2cos(x+pi/2)??
Part a
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3 years ago
#1568
(Original post by MATTTT)
yh but how would you imagine that in an examine. like wtf? Explain to me how you would approach that if you didn't know the answer was that?

Where would you start?
I just do it in my head. You know that it will reflect like a mirror down the line y = x, but you normally just swap the co-ordinates really.
1
3 years ago
#1569
how do you know when to stop on long division algebra again? is it when the order of the remainder becomes smaller than the divisor?
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3 years ago
#1570
(Original post by MATTTT)
yh but how would you imagine that in an examine. like wtf? Explain to me how you would approach that if you didn't know the answer was that?

Where would you start?
Well firstly I'd mark on the axis the points of intersection. With the inverse function, the points of intersection are changed from x to y or y to x, so if the original was (5,10) the inverse would be (10,5). After I had done that I would just draw in the graph
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3 years ago
#1571
(Original post by SeanFM)
Part a
jesus im a **** how have i not seen that ahah duhh.. sorry for wasting your time
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3 years ago
#1572
(Original post by domcandrews)
jesus im a **** how have i not seen that ahah duhh.. sorry for wasting your time
It's not a waste, and no worries
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3 years ago
#1573
(Original post by Cosmi)
Anyone able to help with this? I've never understood this.
speed is a scalar so it cant be negative, also you want to maximise the denomantar so when you divide by the numerator you got a smaller value
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3 years ago
#1574
any revision tips im struggling with solomon papers and im worried they may bring up something totally different??
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3 years ago
#1575
You know for domain and range. If the domain of a function is 'x is a real number' then does that mean that the range will always be 'y is a real number'? Because, surely that means their is no limit to the range? Thanks
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3 years ago
#1576
(Original post by SeanFM)
It's not a waste, and no worries
It won't let me rate your post, but yeh cheers
1
3 years ago
#1577
(Original post by Naga7o)
It is a reflection in the line y=x

Put something reflective like a mirror or your phone with the screen turned off on the line y=x and you can see
Yeh, try doing that in the exam bro

Let me know how it goes

Posted from TSR Mobile
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3 years ago
#1578
Edit - wrong thing - ignore
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3 years ago
#1579
Hi all is the differential of e^x cubed as follows: 3^x squared + e^x cubed

Do you do this by the chain rule, a bit confused :P B
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3 years ago
#1580
(Original post by Ripper Phoenix)
solomon is one of the worst practice for c3. They make you think too much, stuff you dont even need to think about!

stick to the edexcel ones and then just do gold
Just had a look at gold papers. Aren't they just a mixture of questions from the actual Edexcel papers?
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