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April 22, 2026, 06:37:27 am
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Author Topic: Andiio's SM Questions Thread  (Read 9066 times)  Share 

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evaever

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Re: Andiio's SM Questions Thread
« Reply #15 on: January 17, 2011, 07:54:31 pm »
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Look at the sec graph to get x=(pi-B) or (B-pi)
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Andiio

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Re: Andiio's SM Questions Thread
« Reply #16 on: January 20, 2011, 01:11:15 pm »
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Could anyone please help me with this q? :)

Thanks!
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Mao

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Re: Andiio's SM Questions Thread
« Reply #17 on: January 20, 2011, 02:36:53 pm »
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Quote from: Andiio on January 20, 2011, 01:11:15 pm
Could anyone please help me with this q? :)

Thanks!


Every year I see this question get posted. Here's when I asked it back in '08:
http://vce.atarnotes.com/forum/index.php/topic,2171.0.html
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evaever

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Re: Andiio's SM Questions Thread
« Reply #18 on: January 20, 2011, 02:37:15 pm »
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r(pi@/180)=150
rsin@=135

eliminate r, sin@=pi@/200
use cal to solve
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Mao

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Re: Andiio's SM Questions Thread
« Reply #19 on: January 20, 2011, 02:42:00 pm »
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Also, another trick with solving type of questions:

« Last Edit: January 20, 2011, 02:43:49 pm by Mao »
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Andiio

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Re: Andiio's SM Questions Thread
« Reply #20 on: January 24, 2011, 02:10:28 am »
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Thanks heaps everyone!

I have another question related to Cplx Numbers - the question is attached. (just need help with part b)

Not sure how they came about the answers in (b)?

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evaever

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Re: Andiio's SM Questions Thread
« Reply #21 on: January 24, 2011, 07:54:27 am »
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use de Moivre theorem
power increase by 1, modulus is sqrt2 times, arg increase by 45 deg
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Andiio

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Re: Andiio's SM Questions Thread
« Reply #22 on: January 24, 2011, 12:45:58 pm »
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Quote from: evaever on January 24, 2011, 07:54:27 am
use de Moivre theorem
power increase by 1, modulus is sqrt2 times, arg increase by 45 deg

Ahhh I see, haven't seen de Moivre's formula yet - it's later on in the chapter. :\
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Andiio

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Re: Andiio's SM Questions Thread
« Reply #23 on: January 28, 2011, 07:06:57 pm »
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Easy question, but:

Find the Argument of:

z = i - 1

Just wondering if it's best to do graphically/algebraically/whatever.

Thanks!
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Bonifacio

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Re: Andiio's SM Questions Thread
« Reply #24 on: January 28, 2011, 07:14:34 pm »
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I draw a triangle and fill in unit lengths and work from there...
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brightsky

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Re: Andiio's SM Questions Thread
« Reply #25 on: January 28, 2011, 07:15:04 pm »
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Well graphically let's you understand it better.
Draw it and use some basic trig.
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Andiio

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Re: Andiio's SM Questions Thread
« Reply #26 on: January 28, 2011, 07:30:13 pm »
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How about simply via algebraic methods?
Not sure how to 'combine' the sin(theta) = Im(z) / |z| and cos(theta) = Re(z) / |z|
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Pixon

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Re: Andiio's SM Questions Thread
« Reply #27 on: January 28, 2011, 08:54:41 pm »
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after some rearrangment or after you "combine" to two, the Argument can be more simply looked at as

So

There appears to be latex issues

Arg(z)=tan^-1[Im(z)/Re(z)]
        =tan^-1[-1/1]
        =3pi/4
« Last Edit: January 28, 2011, 09:02:44 pm by Pixon »
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brightsky

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Re: Andiio's SM Questions Thread
« Reply #28 on: January 28, 2011, 08:55:32 pm »
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In this context, all apparent algebraic methods are derived from geometry.

Quote from: Pixon on January 28, 2011, 08:54:41 pm
after some rearrangment or after you "combine" to two, the Argument can be more simply looked at as

So

There appears to be latex issues

Arg(z)=tan^-1[Im(z)/Re(z)]
        =tan^-1[-1/1]
        =3pi/4

Pixon, did you put:

Code: [Select]
[tex] ... [/tex]
before and after your equations?
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Pixon

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Re: Andiio's SM Questions Thread
« Reply #29 on: January 28, 2011, 08:58:25 pm »
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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)
« Last Edit: January 28, 2011, 09:03:23 pm by Pixon »
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Quote from: EvangelionZeta on December 19, 2010, 10:51:31 pm
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