Check this out and tell me if it makes sense

K.I.L.E.R · February 26th, 2002, 12:08

0=theta

tan0=sec0

sin0/cos0=1/cos0

sin0cos0=cos0

sin0cos0-cos0=0

cos0(sin0-1)=0

cos0=0 sin0=1

= pie/2, 3pie/2

This is what I found out:

sub (pie/2) back into tan0=sec0

tan(pie/2)=sec(pie/2) = undefined

WTF is my maths teacher doing? He changed the equation into something else but the answer is still wrong.

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Ninjaa · February 26th, 2002, 12:48

The part that is wrong is that he forgot his restrictions. cos0 cannot equal 0. You know that from the second step. Since cos0 cannot equal 0, then pi/2 cannot be an answer. Therefore there is no solution.

K.I.L.E.R · February 26th, 2002, 12:54

Ya but my teacher said it is. That is why I am so confused.

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Ninjaa · February 26th, 2002, 13:54

Jsut tell him to remember his restrictions (or NPVs). If he doesn't believe you, draw the graphs for the two equations. There are clear asymptotes where the 45 degree angles are.

K.I.L.E.R · February 27th, 2002, 06:48

Thanks, it worked.

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SanDRocK · February 27th, 2002, 06:50

Quote:

Originally posted by K.I.L.E.R
0=theta

tan0=sec0

sin0/cos0=1/cos0

sin0cos0=cos0

sin0cos0-cos0=0

cos0(sin0-1)=0

cos0=0 sin0=1

= pie/2, 3pie/2

This is what I found out:

sub (pie/2) back into tan0=sec0

tan(pie/2)=sec(pie/2) = undefined

WTF is my maths teacher doing? He changed the equation into something else but the answer is still wrong.

uggg.....my am i so glad i'm done school i have no idea what all that means anymore

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Recca · February 27th, 2002, 16:26

Call me n idiot but is that simple math or c++

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**Ryos** · February 27th, 2002, 16:28

Quote:

Originally posted by Recca
Call me n idiot but is that simple math or c++

That's simple math. I don't remember what their specific name is, but I believe it's the identities of trigonometry or something like that. They're used to simplify harder equations.

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**Shiori** · February 27th, 2002, 17:01

I feel so dumb.

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Nezzar · February 27th, 2002, 17:31

Quote:

Originally posted by Shiori
I feel so dumb.

You're not the only one

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**Dark Watcher** · February 27th, 2002, 17:50

Trigonometry......yeah....like we needed to know that to survive the real world....heh

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Recca · February 27th, 2002, 18:14

That's exactly what i say to my teacher every day.
But she says that it's not true lot's of jobs use em. BLAH BLAH BLAH BLAH

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Exodus · February 27th, 2002, 22:55

if you're going to do anything with architecture and engineering, you're going to need it. but i'm sure that by now, computers are doing most of that stuff for them.

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Ninjaa · February 27th, 2002, 23:53

I use trig and calculus every day. I am in engineering. It's gotten to the point that I am so familiar with it, that I do use it in everyday life as well. It CAN be useful.

And Kiler, I am glad that I could be of help. I always forgot the restrictions too. (Every bloody test).

to those who are totally lost by all that, it is nothing more than a trigonomic equation (Identities are different). Basically, the question is: where do tanX and secX intersect? We have found this to be nowhere, because division by zero is impossible.

K.I.L.E.R · February 28th, 2002, 01:12

or my teacher's way of putting it:
"Infinity"
I actually do beleive it's infinity cose the graphs are trying to reach pi/2 but it is on an asymptote so it will never reach it considering an asymptote is infinity.

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**Snake785** · February 28th, 2002, 01:21

Heh, I am so lost with that.

Probably because I have never done that kind of math before. I have done restrictions though where in a fraction the denomonator can not = 0.

Ninjaa · February 28th, 2002, 01:53

Kiler, make no mistake on this. Division by zero is impossible. It is undefined. Try dividing 2 chocolate bars into zero pieces (well, maybe not chocolate bars. Try anchovies instead.) It is just not possible.

You do get infinity as you get CLOSE to zero. That is called a limit, and you learn all about those in calculus. It is important to remember that this is NOT dividing by zero though. It is division by a really small number, that is infinitesimally small (my calc teacher even hates using that word). In short, infinity can be defined as the limit of n/x as x approaches zero, and n is any real. n/x when x equals zero is undefined.

EDIT: One last point I wish to make. Is that positive or negative infinity? Check your graph again to see what I mean.

Last edited by Ninja; February 28th, 2002 at 01:55..

Mr Urt · February 28th, 2002, 01:56

Quote:

Originally posted by K.I.L.E.R
0=theta

tan0=sec0

sin0/cos0=1/cos0

sin0cos0=cos0

sin0cos0-cos0=0

cos0(sin0-1)=0

cos0=0 sin0=1

= pie/2, 3pie/2

This is what I found out:

sub (pie/2) back into tan0=sec0

tan(pie/2)=sec(pie/2) = undefined

WTF is my maths teacher doing? He changed the equation into something else but the answer is still wrong.

hhhmmmmm...looks Greek to me. How come bablefish doesn't have Greek translations¿!?!

Ninjaa · February 28th, 2002, 01:58

And you call yourself a master of useless info....

BaD_BURN · February 28th, 2002, 03:02

:confused: :confused: :confused: :confused: :confused: :confused: :confused: :confused: :confused: :confused: :confused: :confused: :confused: :confused:

........................................:confused:

Ignorance is bliss.

February 26th, 2002, 12:08	#1
K.I.L.E.R Registered User Join Date: Jan 2002 Posts: 2,338	Check this out and tell me if it makes sense 0=theta tan0=sec0 sin0/cos0=1/cos0 sin0cos0=cos0 sin0cos0-cos0=0 cos0(sin0-1)=0 cos0=0 sin0=1 = pie/2, 3pie/2 This is what I found out: sub (pie/2) back into tan0=sec0 tan(pie/2)=sec(pie/2) = undefined WTF is my maths teacher doing? He changed the equation into something else but the answer is still wrong. __________________ Agent of love and justice, beautiful Sailor Senshi Sailor Moon.

February 27th, 2002, 17:50	#11
Dark Watcher Coffee Demon Join Date: Jun 2001 Location: Darkness, Unknown Posts: 2,909	argh Trigonometry......yeah....like we needed to know that to survive the real world....heh __________________

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February 26th, 2002, 12:48	#2
Ninjaa Banned Join Date: Oct 2001 Location: Soviet Canuckistan Posts: 7,778	The part that is wrong is that he forgot his restrictions. cos0 cannot equal 0. You know that from the second step. Since cos0 cannot equal 0, then pi/2 cannot be an answer. Therefore there is no solution.

February 26th, 2002, 12:54	#3
K.I.L.E.R Registered User Join Date: Jan 2002 Posts: 2,338	Ya but my teacher said it is. That is why I am so confused. __________________ Agent of love and justice, beautiful Sailor Senshi Sailor Moon.

February 26th, 2002, 13:54	#4
Ninjaa Banned Join Date: Oct 2001 Location: Soviet Canuckistan Posts: 7,778	Jsut tell him to remember his restrictions (or NPVs). If he doesn't believe you, draw the graphs for the two equations. There are clear asymptotes where the 45 degree angles are.

February 27th, 2002, 06:48	#5
K.I.L.E.R Registered User Join Date: Jan 2002 Posts: 2,338	Thanks, it worked. __________________ Agent of love and justice, beautiful Sailor Senshi Sailor Moon.

February 27th, 2002, 16:26	#7
Recca Registered User Join Date: Feb 2002 Location: Where ever fate shall lead me. Posts: 3,941	Call me n idiot but is that simple math or c++ __________________ この世に悪があるとすれば、それは人の心だ。エドワ-ド・D・モリスン

February 27th, 2002, 18:14	#12
Recca Registered User Join Date: Feb 2002 Location: Where ever fate shall lead me. Posts: 3,941	That's exactly what i say to my teacher every day. But she says that it's not true lot's of jobs use em. BLAH BLAH BLAH BLAH __________________ この世に悪があるとすれば、それは人の心だ。エドワ-ド・D・モリスン

February 27th, 2002, 22:55	#13
Exodus ...and now they do. Join Date: Jan 2002 Location: Null Posts: 20,000	if you're going to do anything with architecture and engineering, you're going to need it. but i'm sure that by now, computers are doing most of that stuff for them. __________________ No, I don't like anime, Street Fighter, Japanese music or download video game music. Yes, I know, I'm weird.

February 27th, 2002, 23:53	#14
Ninjaa Banned Join Date: Oct 2001 Location: Soviet Canuckistan Posts: 7,778	I use trig and calculus every day. I am in engineering. It's gotten to the point that I am so familiar with it, that I do use it in everyday life as well. It CAN be useful. And Kiler, I am glad that I could be of help. I always forgot the restrictions too. (Every bloody test). to those who are totally lost by all that, it is nothing more than a trigonomic equation (Identities are different). Basically, the question is: where do tanX and secX intersect? We have found this to be nowhere, because division by zero is impossible.

February 28th, 2002, 01:12	#15
K.I.L.E.R Registered User Join Date: Jan 2002 Posts: 2,338	or my teacher's way of putting it: "Infinity" I actually do beleive it's infinity cose the graphs are trying to reach pi/2 but it is on an asymptote so it will never reach it considering an asymptote is infinity. __________________ Agent of love and justice, beautiful Sailor Senshi Sailor Moon.

February 28th, 2002, 01:21	#16
Snake785 Prepare for Descent... Join Date: Apr 2001 Location: Canada Posts: 2,619	Heh, I am so lost with that. Probably because I have never done that kind of math before. I have done restrictions though where in a fraction the denomonator can not = 0.

February 28th, 2002, 01:53	#17
Ninjaa Banned Join Date: Oct 2001 Location: Soviet Canuckistan Posts: 7,778	Kiler, make no mistake on this. Division by zero is impossible. It is undefined. Try dividing 2 chocolate bars into zero pieces (well, maybe not chocolate bars. Try anchovies instead.) It is just not possible. You do get infinity as you get CLOSE to zero. That is called a limit, and you learn all about those in calculus. It is important to remember that this is NOT dividing by zero though. It is division by a really small number, that is infinitesimally small (my calc teacher even hates using that word). In short, infinity can be defined as the limit of n/x as x approaches zero, and n is any real. n/x when x equals zero is undefined. EDIT: One last point I wish to make. Is that positive or negative infinity? Check your graph again to see what I mean. Last edited by Ninja; February 28th, 2002 at 01:55..

February 28th, 2002, 01:58	#19
Ninjaa Banned Join Date: Oct 2001 Location: Soviet Canuckistan Posts: 7,778	And you call yourself a master of useless info....

February 28th, 2002, 03:02	#20
BaD_BURN In limbo Join Date: Jul 2001 Location: Cave dweller Posts: 914	:confused: :confused: :confused: :confused: :confused: :confused: :confused: :confused: :confused: :confused: :confused: :confused: :confused: :confused: ........................................:confused: Ignorance is bliss.