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Author Topic: Andiio's Questions Thread :)  (Read 7854 times)  Share 

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Andiio

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Andiio's Questions Thread :)
« on: January 06, 2011, 06:18:19 pm »
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Will probably have a multitude of questions over the year, so I've opted out of cluttering the methods forum! :)



What is the best (i.e. most efficient) way of solving general solution questions in an exam? (Assuming that just plugging values into the formulas isn't the best way)


Thanks everyone!
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Re: Andiio's Questions Thread :)
« Reply #1 on: January 06, 2011, 06:19:48 pm »
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LOL DIS GUY
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Andiio

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Re: Andiio's Questions Thread :)
« Reply #2 on: January 06, 2011, 06:20:34 pm »
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Re: Andiio's Questions Thread :)
« Reply #3 on: January 06, 2011, 06:22:00 pm »
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Andiio

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Re: Andiio's Questions Thread :)
« Reply #4 on: January 06, 2011, 06:30:09 pm »
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Ahhh forgot about that!

But for simple questions, simply applying the 'formulas' would be much faster yeah? Only until something tricky comes up?
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Re: Andiio's Questions Thread :)
« Reply #5 on: January 06, 2011, 06:31:55 pm »
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Nah don't use formulas man, that's for noobs. You wouldn't wanna be a noob now, would ya?
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Re: Andiio's Questions Thread :)
« Reply #6 on: January 06, 2011, 06:36:16 pm »
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Ignorance is bliss :P

LOL JK alright thanks!
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Andiio

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Re: Andiio's Questions Thread :)
« Reply #7 on: January 06, 2011, 10:43:21 pm »
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Hey guys, how do you do this question?

Not sure about all the 'formulas' as I'm going to learn TT's method of calculating general solutions.

Thanks!
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brightsky

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Re: Andiio's Questions Thread :)
« Reply #8 on: January 06, 2011, 10:45:25 pm »
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Just sub values in until you hit the bounds.
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Andiio

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Re: Andiio's Questions Thread :)
« Reply #9 on: January 06, 2011, 11:16:31 pm »
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Thanks!

How do I find the general solutions of cos2(x+pi/3)=1/2? (Without applying the formula)

I used TT's method and ended up with:

x = n*pi - pi/6, x = pi/2 + n*pi, n E Z, but the answer states that x = n*pi - pi/6 (which is correct) and n*pi - pi/2 :S

Thanks!
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stonecold

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Re: Andiio's Questions Thread :)
« Reply #10 on: January 06, 2011, 11:20:53 pm »
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can i suggest a really simple way to do general solutions.

just solve for x-axis intercepts as normal, then add + period x n where n E z to the end of the two adjacent intercepts, and you are done.
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Andiio

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Re: Andiio's Questions Thread :)
« Reply #11 on: January 06, 2011, 11:22:49 pm »
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Quote from: stonecold on January 06, 2011, 11:20:53 pm
can i suggest a really simple way to do general solutions.

just solve for x-axis intercepts as normal, then add + period x n where n E z to the end of the two adjacent intercepts, and you are done.

Sorry but what do you mean by the end of the two adjacent intercepts? Sorry i'm really tired x_x
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stonecold

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Re: Andiio's Questions Thread :)
« Reply #12 on: January 06, 2011, 11:27:21 pm »
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Quote from: Andiio on January 06, 2011, 11:22:49 pm
Quote from: stonecold on January 06, 2011, 11:20:53 pm
can i suggest a really simple way to do general solutions.

just solve for x-axis intercepts as normal, then add + period x n where n E z to the end of the two adjacent intercepts, and you are done.

Sorry but what do you mean by the end of the two adjacent intercepts? Sorry i'm really tired x_x

just add what I said to two intercepts that are next to each other, otherwise you will end up doing the same solution twice...because remember, if you add on a period to one solution, you will skip the next one, and end up at the one after that, which is just a period further down or up the x-axis.  picture a graph if you don't get what i mean.

also, i have realised that this is nearly impossible for them to test, as everyone will have different answers which the examiner would need to waste time checking as they are all theoretically correct.
« Last Edit: January 06, 2011, 11:29:15 pm by stonecold »
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Andiio

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Re: Andiio's Questions Thread :)
« Reply #13 on: January 06, 2011, 11:30:20 pm »
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Ah k I get what you mean :)

What do you mean? A gen sol question?
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stonecold

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Re: Andiio's Questions Thread :)
« Reply #14 on: January 06, 2011, 11:33:09 pm »
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Quote from: Andiio on January 06, 2011, 11:30:20 pm
Ah k I get what you mean :)

What do you mean? A gen sol question?

yeah.  i hope my stupid drawing explains it.  :)
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