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Author Topic: Andiio's SM Questions Thread  (Read 8630 times)  Share 

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brightsky

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Re: Andiio's SM Questions Thread
« Reply #30 on: January 28, 2011, 09:20:43 pm »
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Quote from: Pixon on January 28, 2011, 08:58:25 pm
lol I'm not that noob! Nah...Latex is down for the whole forum...look at Mao's post above

edit:lol it all works now BAHA...made a mistake in the latex line. (at least i got it right without latex)

Ah I see.
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Andiio

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Re: Andiio's SM Questions Thread
« Reply #31 on: February 10, 2011, 10:24:10 pm »
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Help with evaluating this expression please? (i know it's noob >_>)

(1 - cos2(x))(1 + cot2(x)) = ?

I end up with sin2(x) - cos2(x) ....

Thanks!
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Andiio

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Re: Andiio's SM Questions Thread
« Reply #32 on: February 10, 2011, 10:28:40 pm »
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Quote from: m@tty on February 10, 2011, 10:27:41 pm


*FACEPALM* >_<

Thanks m@tty!


Mod Edit: Fixed up a bracket which was lacking.
« Last Edit: February 10, 2011, 10:32:31 pm by m@tty »
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m@tty

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Re: Andiio's SM Questions Thread
« Reply #33 on: February 10, 2011, 10:31:02 pm »
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Haha, so I deleted my post cause I thought I made a mistake >.>





EDIT:

Or you could use the trig identity (which I have trouble remembering)




It's (almost) always easier if you can simplify with trig identities.
« Last Edit: February 10, 2011, 10:34:04 pm by m@tty »
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Andiio

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Re: Andiio's SM Questions Thread
« Reply #34 on: February 10, 2011, 10:32:12 pm »
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Quote from: m@tty on February 10, 2011, 10:31:02 pm
Haha, so I deleted my post cause  thought I made a mistake >.>





EDIT:

Or you could use the trig identity (which I have trouble remembering)



I have absolutely no idea why I attemped to expand it... T_T
Thanks a lot! :)

EDIT: Btw, don't you mean 1+cot^2(x) = csc^2(x)? - NEVERMIND :P
« Last Edit: February 10, 2011, 10:36:07 pm by Andiio »
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Andiio

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Re: Andiio's SM Questions Thread
« Reply #35 on: February 10, 2011, 11:05:57 pm »
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New one:

The exact value of cos(pi/11)cos(2pi/11)cos(3pi/11)cos(4pi/11)cos(5pi/11) is?


Thanks a lot! :)
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m@tty

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Re: Andiio's SM Questions Thread
« Reply #36 on: February 10, 2011, 11:25:43 pm »
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Quick google: http://www.answerbag.com/q_view/589204

Haven't had a chance to read it yet though..

EDIT: It does use euler though, so it is beyond spesh level.

So where did you get this question from??
« Last Edit: February 10, 2011, 11:29:22 pm by m@tty »
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Andiio

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Re: Andiio's SM Questions Thread
« Reply #37 on: February 10, 2011, 11:30:19 pm »
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Oh really :S

Was in my homework for Dr. He haha, it was a 'challenge question'

Damn wish I knew how to do it!

EDIT: Haven't come across Euler's yet, :P
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m@tty

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Re: Andiio's SM Questions Thread
« Reply #38 on: February 10, 2011, 11:31:42 pm »
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Doing it using compound angle formulae would be hectic, if possible to figure out where to go next >.>
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Re: Andiio's SM Questions Thread
« Reply #39 on: February 10, 2011, 11:34:47 pm »
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D: LOL

Is Euler's formula a part of the spesh study design?
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m@tty

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Re: Andiio's SM Questions Thread
« Reply #40 on: February 10, 2011, 11:37:15 pm »
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Nup.

But the relevant section is fairly basic, you should look into it; it will make trig questions easier. :P

http://en.wikipedia.org/wiki/Euler's_formula#Relationship_to_trigonometry
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Andiio

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Re: Andiio's SM Questions Thread
« Reply #41 on: February 10, 2011, 11:42:18 pm »
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Sweet - are we allowed to apply it in the exams and such?
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pHysiX

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Re: Andiio's SM Questions Thread
« Reply #42 on: February 11, 2011, 12:46:18 pm »
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hmmm judging from the wiki link:

no that stuff is unnecessary for spesh purposes :D correct me if i'm wrong

but i do know that there is an euler approximation in calculus section of spesh =]
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kamil9876

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Re: Andiio's SM Questions Thread
« Reply #43 on: February 11, 2011, 02:01:37 pm »
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even if you don't know Euler's Formula you can still justify the key step in that solution.


this can be justified using what you know in specialist. In fact just replace with in every instance in that solution and you still should be able to follow it using just specialist knowledge.
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david10d

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Re: Andiio's SM Questions Thread
« Reply #44 on: February 11, 2011, 04:26:07 pm »
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Quote from: Andiio on February 10, 2011, 11:30:19 pm
Oh really :S

Was in my homework for Dr. He haha, it was a 'challenge question'

Damn wish I knew how to do it!

EDIT: Haven't come across Euler's yet, :P

LOL! Thanks for posting that up for me xD. I had a look and straight away gave up on that one.

It doesn't look like people are going to answer that one using compound angle formulae (0 marks given in Dr He's exam lol)
« Last Edit: February 11, 2011, 11:46:57 pm by shaGteM »
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