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November 04, 2025, 09:16:32 pm
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Author Topic: BEC'S methods questions  (Read 107456 times)  Share 

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bec

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Re: BEC'S methods questions
« Reply #210 on: March 16, 2008, 07:52:10 pm »
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true...but rationalising it still gives me the wrong answer (
any other ideas?
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ed_saifa

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Re: BEC'S methods questions
« Reply #211 on: March 16, 2008, 07:56:22 pm »
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hmm are you sure the answer in the book is right?
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ed_saifa

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Re: BEC'S methods questions
« Reply #212 on: March 16, 2008, 08:00:05 pm »
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i think you did it right because if you check on the calculator agrees
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Collin Li

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Re: BEC'S methods questions
« Reply #213 on: March 16, 2008, 08:02:32 pm »
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Doesn't rationalising give you ?
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ed_saifa

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Re: BEC'S methods questions
« Reply #214 on: March 16, 2008, 08:04:19 pm »
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beats me. ambiguous case
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Mao

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Re: BEC'S methods questions
« Reply #215 on: March 16, 2008, 08:05:18 pm »
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rationalisation gives

the textbook has it wrong
or it might have meant 195o (which gives )
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bec

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Re: BEC'S methods questions
« Reply #216 on: March 16, 2008, 08:06:23 pm »
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um, i spose this would be a typical example of the silly mistakes i was talking about before
i checked on my calc but it was in radian mode. so annoying!

thanks anyway though
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Mao

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Re: BEC'S methods questions
« Reply #217 on: March 16, 2008, 08:08:50 pm »
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bec that shouldnt really matter (or you think you have made a mistake where you havent)

, no doubt about it
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bec

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Re: BEC'S methods questions
« Reply #218 on: March 16, 2008, 08:15:30 pm »
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no what i meant was, i got the answer (which is "wrong" according to the solutions i was given) and then double-checked it in the calc by plugging in tan(165) which gave me -15.
so in this case, radians vs degrees did matter

anyway i got it right so whatever...
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Matt The Rat

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Re: BEC'S methods questions
« Reply #219 on: March 16, 2008, 08:20:22 pm »
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Coblin, I had stuff like that in my Methods CAS book (Essentials) last year (ie, compound angle questions) but none of it came up on SACs or either of the exams, from memory at least.
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Collin Li

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Re: BEC'S methods questions
« Reply #220 on: March 16, 2008, 08:21:30 pm »
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Quote from: Matt The Rat on March 16, 2008, 08:20:22 pm
Coblin, I had stuff like that in my Methods CAS book (Essentials) last year (ie, compound angle questions) but none of it came up on SACs or either of the exams, from memory at least.

Oh. I remember Essentials had that in their Methods book for the non-CAS course too. You don't need to know it.
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Glockmeister

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Re: BEC'S methods questions
« Reply #221 on: March 16, 2008, 08:45:51 pm »
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Quote from: coblin on March 16, 2008, 08:21:30 pm
Quote from: Matt The Rat on March 16, 2008, 08:20:22 pm
Coblin, I had stuff like that in my Methods CAS book (Essentials) last year (ie, compound angle questions) but none of it came up on SACs or either of the exams, from memory at least.

Oh. I remember Essentials had that in their Methods book for the non-CAS course too. You don't need to know it.

Really? I don't remember that.
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bec

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Re: BEC'S methods questions
« Reply #222 on: March 26, 2008, 07:59:18 pm »
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how do you find this accurately?
lim   
x-->0
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ed_saifa

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Re: BEC'S methods questions
« Reply #223 on: March 26, 2008, 08:07:58 pm »
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You need to cancel out the x on the bottom somehow.
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"How can you expect to do well when
-you draw a lemon as having two half-cells connected with a salt bridge
-your lemons come with Cu2+ ions built in" - Dwyer
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dcc

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Re: BEC'S methods questions
« Reply #224 on: March 26, 2008, 08:15:23 pm »
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subbing in zero gives 1/6
« Last Edit: March 26, 2008, 08:29:26 pm by dcc »
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