Maths

**Pajo** · 14 Dec 06, 13:16

OK, Yuko, here it is:

(sin3a+sina*cos2a)/1-cosa=ctg(a/2)

highlighted are degrees...

**Pajo** · 14 Dec 06, 13:42

I'm waiting Yuko.......

**brehme1989** · 14 Dec 06, 13:57

wtf is ctg? :S

I'm doing C3 maths trigonometry, never came across with ctg! And I have the C4 book, not there either

**Pajo** · 14 Dec 06, 14:07

You don't know what is ctg? :wtf: What do you study there man???

ctg is opposite of tg... There are four trigonometrical functions: sin, cos, tg, ctg...

ctg=1/tg

or, ctg=cos/sin, while tg=sin/cos...

**brehme1989** · 14 Dec 06, 14:15

No I've never came across ctg or tg. We just use sin and cos, as in the book.

(co)sec θ
cot θ
arc(sin/cos/tan)

Those are the types we use.

I even asked someone who has graduated from university after studying maths and he doesn't know what ctg is! Maybe your books are ancient

P.S: I'll tell you what why don't you give me the answer and working out

**thomas_inter** · 14 Dec 06, 14:21

Geezz... and I thought the ABC Formula was hard...

**brehme1989** · 14 Dec 06, 14:30

@pajo, If you didn't know, C1, C2, C3, C4, are A-level maths...

EDIT: http://en.wikipedia.org/wiki/Tangens Still no tg and ctg

**Pajo** · 14 Dec 06, 14:34

tg is tan actually... (i think)... tan=sin/cos, right?

here is the solution:

(sin3a+sina*cos2a)/1-cosa=ctg(a/2)

(sina(sin2a+cos2a))/1-cosa=ctg(a/2)

sina/(1-cosa)=ctg(a/2)

sin(2a/2)/2(1-cosa/2)=ctg(a/2)

(2sin(a/2)cos(a/2))/2sin2(a/2)=ctg(a/2)

ctg(a/2)=ctg(a/2)

**brehme1989** · 14 Dec 06, 14:40

It'd be nice giving me the question as well as the equation

I went ahead and even found a

**Pajo** · 14 Dec 06, 14:48

From the wiki, I can see that tan is same with tg... But I don't get it, where is the ctg? I gave you the formulas man...

sin - sinus
cos - cosinus
tg(tan) - tangens
ctg - cotangens

and this is the equlation: ctg(a/2)=ctg(a/2)... That ws the whole point of the example, to show that (sin3a+sina*cos2a)/1-cosa=ctg(a/2) is equal to ctg(a/2)=ctg(a/2)...

**brehme1989** · 14 Dec 06, 14:51

That we give BEFORE we ask the other to solve it!

It's like me telling to you:

Germany

You sit your ass down and write a whole essay on its history, culture etc and I only needed you to tell me which is the biggest country Denmark borders with!!!!

**UhUhOleguer** · 14 Dec 06, 16:05

ctg = cotangens
tg = tangens

I can't really believe that you don't do tangens and cotangens at school..

1/tg = cotg

**Khalifa** · 14 Dec 06, 16:17

what the **** is cotangen....as far as math..i stopped in grade 11.

**Pajo** · 14 Dec 06, 16:30

Originally Posted by UhUhOleguer

ctg = cotangens
tg = tangens

I can't really believe that you don't do tangens and cotangens at school..

1/tg = cotg

Yup, that's what I said... Yuko has friend who finished university, and he didn't know what is ctg... Only if maths teacher (she's a bitch) hears this...

**brehme1989** · 14 Dec 06, 17:41

i know tangents, i just have never seen ctg and tg as expressions.

Anyway, it was last year's work, so I don't need to remember it

**Pajo** · 14 Dec 06, 17:49

Originally Posted by Yuko

Anyway, it was last year's work, so I don't need to remember it

Oh, but if you go to university, than you should definitely remember!!

**Hasan** · 14 Dec 06, 18:31

C'mon guys, relax a brain litlle, I hate maths too, I will have exam "Maths methods" and I need too start study soon.

**brehme1989** · 14 Dec 06, 20:08

Maths is only very hard for those that can't think very well

And of course those that are too lazy to think

**thomas_inter** · 14 Dec 06, 20:15

Originally Posted by Yuko

Maths is only very hard for those that can't think very well

And of course those that are too lazy to think

Well... you've got Alpha kind of people and Betha kind of people... so... it's just how your brains work.

**To1do** · 14 Dec 06, 20:27

What is Math ?

Thread: Maths

Thread Tools

Display

Maths

Posting Permissions