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-   -   Maths help: sin and cosine (https://www.graalians.com/forums/showthread.php?t=7820)

callimuc 06-24-2012 04:56 PM
Maths help: sin and cosine
 
Well I got my Math-Finals tomorrow and have just been doing some exercises. But I'm stuck on this part. Maybe someone does understand it on here

When I got this calculation:
http://i.imgur.com/sNOtl.png

I don't get the part inside the [] brackets
I know that they made it something like
x-3/4 = sin(φ)
but how did they mix it with the cos²(φ) to -((x-3)/4)²+1 ?


Would be cool if someone could help me

NCJohn 06-24-2012 05:09 PM
2+2=4
ez

Higbey 06-24-2012 05:09 PM
isnt it sine and cosine?
anyway do you know SOH CAH TOA?

callimuc 06-24-2012 05:12 PM
Quote:
Posted by NCJohn (Post 147461)
2+2=4
ez
Random post?

Quote:
Posted by Higbey (Post 147462)
isnt it sine and cosine?
oh jea <.<

Quote:
Posted by Higbey (Post 147462)
anyway do you know SOH CAH TOA?
Just the names but never used it. Also it's most likely not related to what I need

Racil 06-24-2012 05:30 PM
You've basicly solved it already, you just have to put the sine in the equation.

Higbey 06-24-2012 05:38 PM
i hate math with a passion and got in fights with serveral horrible math teachers over the years, so i cant really help.

callimuc 06-24-2012 05:39 PM
Quote:
Posted by Racil (Post 147473)
You've basicly solved it already, you just have to put the sine in the equation.
Well just looked into another solution and there it said almost the same


sin(φ) = (x-3)/4

y = 4+8*(1-sin²(φ))

sooo is cos²(φ) the same as 1-sin²(φ)?

Racil 06-24-2012 05:52 PM
Yupp.
I kind of suck at explaining stuff so i'll just give you a link to wikipedia

http://en.wikipedia.org/wiki/Pythago...etric_identity

Sorry :(

callimuc 06-24-2012 05:54 PM
Ah thanks a lot! You saved my day :)

Jester Lapse 06-24-2012 07:15 PM
OPPOSITE OVER HYPOTENUSE IS SINE i win gibe me cookie

Zero02 06-24-2012 07:30 PM
Is this pre-cal? o.o

callimuc 06-24-2012 07:39 PM
Quote:
Posted by Jester Lapse (Post 147533)
OPPOSITE OVER HYPOTENUSE IS SINE i win gibe me cookie
What are you talking about?

Quote:
Posted by Zero02 (Post 147541)
Is this pre-cal? o.o
Precalculus*

Gues so. Never heard of Precalculus but from what I found in Google it seems to be something like that

Dusty 06-24-2012 07:51 PM
Man I was always horrible at math.

Jester Lapse 06-24-2012 07:52 PM
Quote:
Posted by callimuc (Post 147544)
What are you talking about?
Triangles :(

Skill 06-24-2012 07:54 PM
Quote:
Posted by Higbey (Post 147462)
isnt it sine and cosine?
anyway do you know SOH CAH TOA?
Not related, soh cah toa is used for geometric purposes and this isn't for finding the measure of an angle or segment of a triangle.

This question is damn hard too, I'm supposedly at genius level at math and I can't even solve it QQ.

callimuc 06-24-2012 07:55 PM
Quote:
Posted by Jester Lapse (Post 147553)
Triangles :(
I know but it isn't related to this o,O ^^

Jester Lapse 06-24-2012 07:55 PM
o...but I'm still a winner!

callimuc 06-24-2012 07:55 PM
Quote:
Posted by Dusty (Post 147552)
Man I was always horrible at math.
I'm still horrible at it :(

Zero02 06-24-2012 08:04 PM
Quote:
Posted by callimuc (Post 147544)
What are you talking about?
Precalculus*

Gues so. Never heard of Precalculus but from what I found in Google it seems to be something like that
I only took algebra 2 but i will never take it

Emera 06-24-2012 09:34 PM
escuse me? is that supposed to be a picture of a bird or something? I don't have anything to contribute, but the fact that you're studying things like that impresses me :3

Zero02 06-24-2012 09:37 PM
I wonder if Callimuc is a junior or senior at high school

callimuc 06-24-2012 09:39 PM
Quote:
Posted by Emera (Post 147655)
escuse me? is that supposed to be a picture of a bird or something? I don't have anything to contribute, but the fact that you're studying things like that impresses me :3
Dont get the bird picture.

And I'm only studying it because I want to pass the finals :/ else I would never touch anything like that. Maybe just some simple sin(), cos() or tan() in GS2

Quote:
Posted by Zero02 (Post 147659)
I wonder if Callimuc is a junior or senior at high school
We have a different school system than in america. The sort school I'm in goes until the 10th class. There are 2 more schools which are until the 9th and the 13th class. Later on you can attempt (depending on your qualification) other schools.
And this is my last year and after that I most likely won't go to school anymore. Except I when I have to attempt a "jobs-school" but that will be based on the job I'll do. And the class I'm is especially for maths. I could have also choosen languages (spain or french), crafting, economic and some others but maths seemd to be the most easy one. Well I think I was wrong at that time.

Zero02 06-24-2012 09:45 PM
Quote:
Posted by callimuc (Post 147661)
We have a different school system than in america. The sort school I'm in goes until the 10th class. There are 2 more schools which are until the 9th and the 13th class. Later on you can attempt (depending on your qualification) other schools.
And this is my last year and after that I most likely won't go to school anymore. Except I when I have to attempt a "jobs-school" but that will be based on the job I'll do. And the class I'm is especially for maths. I could have also choosen languages (spain or french), crafting, economic and some others but maths seemd to be the most easy one. Well I think I was wrong at that time.
Damn!

Emera 06-24-2012 09:52 PM
Quote:
Posted by callimuc (Post 147661)
Dont get the bird picture.

And I'm only studying it because I want to pass the finals :/ else I would never touch anything like that. Maybe just some simple sin(), cos() or tan() in GS2



We have a different school system than in america. The sort school I'm in goes until the 10th class. There are 2 more schools which are until the 9th and the 13th class. Later on you can attempt (depending on your qualification) other schools.
And this is my last year and after that I most likely won't go to school anymore. Except I when I have to attempt a "jobs-school" but that will be based on the job I'll do. And the class I'm is especially for maths. I could have also choosen languages (spain or french), crafting, economic and some others but maths seemd to be the most easy one. Well I think I was wrong at that time.
We'll stick with comprehensive schools over here thank you ^_^

callimuc 06-24-2012 09:53 PM
Quote:
Posted by Emera (Post 147670)
We'll stick with comprehensive schools over here thank you ^_^
^_^


Oh btw this was the easier part of the finals. So yah I hate maths but yet I love to mess around with it as long as it's not too hard

The Doctor 06-24-2012 11:54 PM
Hehe I hope 9th grade math after the summer break isn't hard...

Emera 06-25-2012 12:14 AM
Quote:
Posted by callimuc (Post 147671)
^_^


Oh btw this was the easier part of the finals. So yah I hate maths but yet I love to mess around with it as long as it's not too hard
Snap. I get all pleased with myself when I figure something complicated out.

Pazx 06-25-2012 07:23 AM
Quote:
Posted by callimuc (Post 147544)
Precalculus*
What. You are such a tool. You attempt to correct somebody's shorthand (which might I add is widely used around the world), and make a mistake the very next word.

And stop saying jea. I don't care if your German, a ******ed cross between two languages doesn't work.

Anyway, your problem was resolved, so... :rolleyes:

callimuc 06-25-2012 11:32 AM
Quote:
Posted by Pazx (Post 147911)
What. You are such a tool. You attempt to correct somebody's shorthand (which might I add is widely used around the world), and make a mistake the very next word.

And stop saying jea. I don't care if your German, a ******ed cross between two languages doesn't work.

Anyway, your problem was resolved, so... :rolleyes:
Because I gues it would be called precal as the proper precal. But again I never heard of it so I'm not sure.

If you don't care if I'm german or not than simply ignore it. You should ignore it anyways if you got no clue of it since it's not the main topic on here and they simply asked me. Maybe if you got any problems you should try to solve them in an other way rather than posting BS.

Quote:
Posted by Alexei (Post 147937)
Why don't you say it to yourself?if you didn't do this childish I would help you.
Even though I'm good at maths :rolleyes:
Because this is not a forum games thread which has already been made 5 times and got no use since then. And I doubt that you could even help me.

The Doctor 06-25-2012 03:00 PM
Alexei, genius of le math.


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