AQA FP1 (1st June) Watch

Adam92
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#161
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#161
(Original post by Mitch92uK)
Why are you taking 2 calculators?
Graphics one for plotting graphs, which unfortunately doesn't give answer in surd or pi form, so the natural display one is more convenient for normal calculations.
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Katermerang
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#162
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#162
(Original post by Robbie10538)
It can integrate numerically (both of them can) but not symbollically (which is the banned type)



lol pretty much bored at the moment. I dont see what else I can do as I've looked over everything.

Revise chemistry:p: , but yeah i'm pretty bored of that too.
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nick3000
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#163
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#163
For General solutions of Equations involving sin and cos do you have to give more than one general solution?
One past paper required two solutions but the others seemed to require one.
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shining_star
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#164
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#164
(Original post by nick3000)
For General solutions of Equations involving sin and cos do you have to give more than one general solution?
One past paper required two solutions but the others seemed to require one.
cos and tan only need one equation. sin needs two
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Katermerang
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#165
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#165
(Original post by nick3000)
For General solutions of Equations involving sin and cos do you have to give more than one general solution?
One past paper required two solutions but the others seemed to require one.
It depends on the question, if its cos you can write +-, as they are the same when solving cos. But for sin your two critical values are completly distincit, which would normally lead you to two general solutions.
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ljc1
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#166
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#166
Arghhh we have'nt been taught anything about finding 2 critical values for sin, just one could someone please show me an example of how to do this. Thanks!

... *edit* heres an example of what I'd done (June 07 Q6.)
sin(2x-pi/2)=root3/2
x=piN + (-1^n)a
2x - pi/2=piN + (-1^n)pi/3 + pi/2
x=pi/2 N + (-1^n)pi/6 + pi/4
the mark scheme doesn't really make sense to me at all
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Robbie10538
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#167
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#167
(Original post by Katermerang)
It depends on the question, if its cos you can write +-, as they are the same when solving cos. But for sin your two critical values are completly distincit, which would normally lead you to two general solutions.
in your book does it introduce



... + (-1)^{n} ...
as a way of finding the distinct values?
edit: (in the general solution of sine graphs)
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Adam92
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#168
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#168
(Original post by ljc1)
Arghhh we have'nt been taught anything about finding 2 critical values for sin, just one could someone please show me an example of how to do this. Thanks!
One would be x = 360n + a, the other would be x = 360n + (180 - a) in degrees. Where a is the value you find from using inverse sine on the RHS.
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Katermerang
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#169
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#169
(Original post by ljc1)
Arghhh we have'nt been taught anything about finding 2 critical values for sin, just one could someone please show me an example of how to do this. Thanks!
Ok this is the method to solve any trig equation:

Find two critical values so for cos use cos-1(value) and find the negative value, as they are the same, ie two values between -180 and 180 or -pi and pi.

For sin use sin-1(value) and then do [180 (or pi) - sin-1(value)], to find your second critical value.

ADD 2(Pi)n to Both your critical values in two separate equations for cos you can use one just write +-(critical value) and have one equation

Now equate these to whats inside the bracket of sin or cos, solve to get x on its own.

For tan you only need one critical value as it repeats every 180, and add (pi)n as your general solution rather than 2(pi)n.


I hope thats good enough, thats is about as best i can do, from a keyboard rather than face to face.
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Adam92
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#170
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#170
Good luck all, I'm sure the exam won't be that bad!
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Katermerang
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#171
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#171
(Original post by Robbie10538)
in your book does it introduce



... + (-1)^{n} ...
as a way of finding the distinct values?
I dont think so but i have never found it hard to find distinct values, all I need is two critical values (just negative cos) or (180-sin) and its easy to find any other one you want from there on.
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Robbie10538
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#172
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#172
(Original post by Katermerang)
I dont think so but i have never found it hard to find distinct values, all I need is two critical values (just negative cos) or (180-sin) and its easy to find any other one you want from there on.
The oxford FP1 book encourages us to have it in the form


\pi n + (-1)^{n} \alpha = \phi

To avoid confusion, both methods are acceptable- look at the jan 06 report for a sine graph general solution
A good number of candidates quoted the solution for sin θ = sin 50º correctly as
θ = 180nº + (−1)^n(50º), but even then they were not always successful in deducing the general solution for x.
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Katermerang
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#173
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#173
(Original post by Robbie10538)
The oxford FP1 book encourages us to have it in the form


\pi n + (-1)^{n} \alpha = \phi

To avoid confusion, both methods are acceptable- look at the jan 06 report for a sine graph general solution
Thats the thing about f-maths there are always so many ways of doing things, especaily in D2 basicaly we only follow about 2 or 3 of the algorithms in the book the rest are just my teachers own personal way of doing things, which sometimes is not on the markschme!?!

But they assure me the examiner will know what i am doing.
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rachxl
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#174
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#174
I'm going to use an fx-7400G PLUS

I am jealous of people who get can it into pi form and whatnot, I can only just about manage to plot a graph with mine (although that has more to do with my "skills" than the calculator itself, I suspect :ninja:)

Good luck for tomorrow everyone :thumbsup:
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Katermerang
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#175
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#175
(Original post by Robbie10538)
The oxford FP1 book encourages us to have it in the form


\pi n + (-1)^{n} \alpha = \phi

To avoid confusion, both methods are acceptable- look at the jan 06 report for a sine graph general solution
Ha i just realised, looking at your sig, we do exatly the same subjects and exam boards and modules expet i dont do geography, and wont be doing f-maths next year.
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Robbie10538
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#176
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#176
(Original post by Katermerang)
Ha i just realised, looking at your sig, we do exatly the same subjects and exam boards and modules expet i dont do geography, and wont be doing f-maths next year.
Yeah we have great subjects!

(Original post by rachxl)
Good luck for tomorrow everyone
Good luck too and everyone else!

I'll probably be on tomorrow to see what I got wrong although I should revise chemistry!
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abcxyz6666
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#177
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#177


\pi n + (-1)^{n} \alpha = \phi

this is the only formula I know for sin graph. Whats the one in the other text book
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Katermerang
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#178
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#178
Right time for a shower and bed.

Hope you all do well!!!!
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pcfailure
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#179
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#179
(Original post by Katermerang)
Right time for a shower and bed.

Hope you all do well!!!!
Just had my shower =P!!

But yeah, good luck everyone xD.

(See you all tomorrow to discuss the answers! =P)
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El Guerrouj
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#180
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#180
Having a shower and going to bed, good luck everyone
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