Prelim 2015 Chit Chat Thread (8 Viewers)

Sien · Jun 30, 2015

trig isn't that bad tho

Speed6 · Jun 30, 2015

MilkyCat_ said:
I thought trig would be up there
I missed so many lessons when we were doing trig so I'm struggling to catch up haha

I can help, but we haven't finished the whole topic. Shoot me a message if you want, I'm more than happy to give you some notes but I gotta say that there is a lot of memorising in the topic lol.

Also, how frequently and how long are your extension 1 lessons?

MilkyCat_ · Jun 30, 2015

Speed6 said:
I can help, but we haven't finished the whole topic. Shoot me a message if you want, I'm more than happy to give you some notes but I gotta say that there is a lot of memorising in the topic lol.

Also, how frequently and how long are your extension 1 lessons?

thanks, if i'm really struggling I will
well we have 4 lessons a fortnight and they are 50 mins long

Sien · Jun 30, 2015

how long does it take to finish 1mxt1 topic in class? My teacher taught 2 topics in 4 days gg brain ded by the end of it

MilkyCat_ · Jun 30, 2015

Sien said:
how long does it take to finish 1mxt1 topic in class? My teacher taught 2 topics in 4 days gg brain ded by the end of it

wtf
what topics?

Speed6 · Jun 30, 2015

Sien said:
how long does it take to finish 1mxt1 topic in class? My teacher taught 2 topics in 4 days gg brain ded by the end of it

Well what topics were they?

MilkyCat_ said:
thanks, if i'm really struggling I will
well we have 4 lessons a fortnight and they are 50 mins long

Np

My classes are exactly the same, but ours runs I'm the afternoon when school finishes

Sien · Jun 30, 2015

MilkyCat_ said:
wtf
what topics?

trigs and functions(thankfully)

Speed6 · Jun 30, 2015

Ooo I forgot to mention.

Permutations and Combinations is a killer.

Sien · Jun 30, 2015

It was literally 3 days of study for test which i screwed up big time

MilkyCat_ · Jun 30, 2015

Sien said:
It was literally 3 days of study for test which i screwed up big time

as long as you know where you went wrong it doesn't matter

Drsoccerball · Jun 30, 2015

Speed6 said:
Ooo I forgot to mention.

Permutations and Combinations is a killer.

Do these type of questions longer than other types. Take your time!

Green Yoda · Jun 30, 2015

What is the easiest way to remember all the trig equation formulas?

Speed6 · Jun 30, 2015

Atm repetition and highlighting. Do it atleast 4 times in the morning, afternoon and night before you go to bed or something. And like in 2-3 days you will learn them off by heart.

Also write the formulas down on a separate sheet dedicated for Trig

MilkyCat_ · Jun 30, 2015

Rathin said:
What is the easiest way to remember all the trig equation formulas?

do heaps of questions and eventually you will remember them

Drsoccerball · Jun 30, 2015

Rathin said:
What is the easiest way to remember all the trig equation formulas?

$cos2\theta= cos^2\theta -sin^2\theta$

$sin2\theta= 2sin\theta cos\theta$

If you memorise these youre all good since for equation 1 sin^2x +cos^x =1 therefore you can rearrange.

$sin\theta= \frac{2t}{1+t^2}$

$cos\theta = \frac{1-t^2}{1+t^2}$
For tan you can divide sin over cos... Both have the denominator at 1+t^2. Sin is nice so he has 2t

Cos is evil so hes 1-t^2

Drsoccerball · Jun 30, 2015

Wait do you mean the ones equal to one ? :
This is how i "remembered" them...
$sin^2x +cos^2x =1$ Obvious...

$1+cot^2x = cosec^2x$ Divide equation one by sin^2x

$tan^2x +1=sec^2x$ Divide equation one by cos^2x

ive never actually memorised them

Speed6 · Jun 30, 2015

Double angle results:

$sin2\theta =2sin\thetacos\theta$

$cos2\theta=sin^2\theta-cos^2\theta$

$cos2\theta=2cos^2\theta-1$

$cos2\theta=1-2sin^2\theta$

$\therefore tan2\theta=\frac{2tan\theta}{1-tan^2\theta}$

Sien · Jun 30, 2015

I just draw the triangle for the t formula, it's so much easier

Drsoccerball · Jun 30, 2015

Speed6 said:
Double angle results:

$sin2\theta =2sin\thetacos\theta$

$cos2\theta=sin^2\theta-cos^2\theta$

$[B]cos2\theta=2cos^2\theta-1 [/B]$

$cos2\theta=1-2sin^2\theta [/B]$

$\therefore tan2\theta=\frac{2tan\theta}{1-tan^2\theta}$

For extension 1 integration you need these most people again memorise that:

$\frac{1}{2}(cos2\theta +1) = cos^2 \theta$

But then youre memorising another formula... Keep memorising to a min

Speed6 · Jun 30, 2015

Even though I don't have much integration knowledge, could you please show me how to derive it?

Prelim 2015 Chit Chat Thread (8 Viewers)

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