THESE TEARS ARE ONES OF JOY

[Not Meowth]

... WHAT

unless your school is one of those that uses sin^-1. in which case

... what

Oh yeah, we use that. I didn't know there were other ways to put it. So just "... what".

Anyway, while I'm here I may as well say that today's History exam (which went WAY better than I thought it would, yay) marks the end of my exams too =D

 

[Skroy]

4sinx = 3tanx

Whoa, this equation does not look right. I tried solving for it on my calculator and I couldn't get the two to equate. Or maybe I'm missing something, perhaps?

Anyway, congrats on finishing your exams (a little late but whatever). I wish I could say the same for me... but then again all I have left are math, chemistry and physics (in other words easy marks if I say so myself (though I probably shouldn't be too cocky about it; who knows what could happen?))

 

[Tailsy]

what

i don't understand

they're making you go to school on monday so you can learn year 12 stuff, even though you've got a month until everyone would get summer holidays anyway.

maybe it's just some weird scottish thing. O_o

It's not year 12 it's S6. And yeah, we get new timetables for the last two weeks of school. <:3

 

[goldenquagsire]

It's not year 12 it's S6. And yeah, we get new timetables for the last two weeks of school. <:3

silly scotsmen with their weird education systems and their loch ness monsters. O_o

also, man that sucks ass. do they try to justify keeping you guys back another two weeks, or is it just "we're gonna do this and you're gonna shut up".

 

[Tailsy]

silly scotsmen with their weird education systems and their loch ness monsters. O_o

also, man that sucks ass. do they try to justify keeping you guys back another two weeks, or is it just "we're gonna do this and you're gonna shut up".

Silly Englishmen with their 'sixth form OR college' system that doesn't make any sense.

For us now it's really a "we're gonna do this and if you say anything about it you get kicked out immediately." I mean, we don't HAVE to be there any more so they can kick us out for anything. *shrug*

 

[opaltiger]

Whoa, this equation does not look right. I tried solving for it on my calculator and I couldn't get the two to equate. Or maybe I'm missing something, perhaps?

o.o how were you attempting to solve it on a calculator (and on what model?)?

 

[Skroy]

o.o how were you attempting to solve it on a calculator (and on what model?)?

Actually, all I did was substitute the x value and plugged it into the equation using my calculator (SHARP calculator, model EL-520W). Unless I'm missing something or I'm way off mark, "4 sin x = 3 tan x" looks like a weird equation to me.

Speaking of math, I just finished my math exam. ^.^ I tried to fake tears during the exam for the heck of it just to get my teacher to laugh, but it didn't happen (might as well do it during the physics exam. :P). Just as I thought, it was easy marks. Who would like to solve this trigonometric identity from my exam by QED?

(sin^2 x - 4)/(sin^2 x - 2 sin x) = 1 + 2/sin x

Edit: Never mind, I saw what you did. It makes sense, though, this is the first time I've seen "arcsin" in my life. What is it? You've got me curious and craving to learn it! I need to know! (I use sin^-1, as it is what I've been currently taught to use over here).

 

[goldenquagsire]

For us now it's really a "we're gonna do this and if you say anything about it you get kicked out immediately." I mean, we don't HAVE to be there any more so they can kick us out for anything. *shrug*

wow, that's really bastardly. D:

 

[opaltiger]

Unless I'm missing something or I'm way off mark, "4 sin x = 3 tan x" looks like a weird equation to me.

it's a perfectly normal trigonometric equation. o.o

What is it? You've got me curious and craving to learn it! I need to know! (I use sin^-1, as it is what I've been currently taught to use over here).

ahhhhhh

arcsine is the inverse operation of sine. if sin x = y, arcsin y = x. sin^-1 x is simply the notation you find on calculators, but it is not the name of the function and you really shouldn't use it, especially as it could be confused with (sin x)^-1.

(sin^2 x - 4)/(sin^2 x - 2 sin x) = 1 + 2/sin x

sure, why not

(sin^2x - 4) / (sin^2x - 2sinx) =
(sinx - 2)(sinx + 2) / (sin^2x - 2sinx) =
(sinx - 2)(sinx + 2) / (sinx[sinx - 2]) =
([sinx - 2][sinx + 2] / [sinx - 2]) / sinx =
(sinx + 2)/sinx =
(sinx/sinx) + (2/sinx) =
1 + (2/sinx)
QED.

 

[Mhaladie]

o.o how were you attempting to solve it on a calculator (and on what model?)?

On just a TI-84 you can graph y=3tanx and y=4sinx and see where they intersect. I think it gives you the same answers..?

 

[Skroy]

arcsine is the inverse operation of sine. if sin x = y, arcsin y = x. sin^-1 x is simply the notation you find on calculators, but it is not the name of the function and you really shouldn't use it, especially as it could be confused with (sin x)^-1.

I thought as much. Thanks for the info!

And while I'm here, I'll just say I finish my physics lab exam, which went better than I expected (hooray for me!). Only two more exams and then I can really cry tears of joy - literally.

 

[opaltiger]

On just a TI-84 you can graph y=3tanx and y=4sinx and see where they intersect. I think it gives you the same answers..?

yeah, of course it would, but the way Skroy Horitz was describing the process it sounded like he was doing something else.