Maths Extension 2 Predictions/Thoughts (5 Viewers)

[gunnerfan99]

Wait was 4U this year harder or easier than last year?

easier

 

[scaryshark09]

1 C
2 D
3 B
4 C
5 A
6 A
7 B
8 D
9 D
10
so overall, is this what people think? idk about 6 and 10

 

[pdawg]

easier

noooo way

 

[gunnerfan99]

1 C
2 D
3 B
4 C
5 A
6
7 B
8 D
9 D
10
so overall, is this what people think? idk about 6 and 10

is 6 not A?

 

[thomas mcnamee]

1 C
2 D
3 B
4 C
5 A
6
7 B
8 D
9 D
10
so overall, is this what people think? idk about 6 and 10

7 is c or roots of unity would not be possible

 

[scaryshark09]

is 6 not A?

yeh i think idk
i edited it in
what about 10?

 

[gunnerfan99]

noooo way

Last year I struggled towards the end, this year was generally hard but all doable.

 

[gunnerfan99]

7 is c or roots of unity would not be possible

No c is wrong, take theta to be 2pi greater

 

[scaryshark09]

7 is c or roots of unity would not be possible

how can c be right
a counterexample would be theta = pi/4 or 9pi/4

 

[gunnerfan99]

I'm working solely on 10 now ive done the rest of the exam.

 

[pdawg]

7 is c or roots of unity would not be possible

lets goooooo i thought so too

 

[thomas mcnamee]

how can c be right
a counterexample would be theta = pi/4 or 9pi/4

9pi/4 is the same as pi/4 u smart little jit

 

[scaryshark09]

No c is wrong, take theta to be 2pi greater

yeh so considering this, would b be right?

 

[pdawg]

how can c be right
a counterexample would be theta = pi/4 or 9pi/4

what do u think the answer is

 

[scaryshark09]

9pi/4 is the same as pi/4 u smart little jit

no its not

 

[notme123]

is 6 not A?

its b. B does not have a definitive frequency for shm

A is actually periodic in pi

 

[gunnerfan99]

9pi/4 is the same as pi/4 u smart little jit

technically not

 

[thomas mcnamee]

technically not

sure if ur being picky, but in terms of an argument, yes

 

[scaryshark09]

i think i got 3/10 in mc

 

[notme123]

if you start with two polars being the same, the implication that their values of theta are the same is wrong.

e.g. exp(i pi/2) = exp(i 5pi/2) but pi/2 does not equal 5pi/2