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You are not logged in. #1 20051215 06:14:57
Proving an IdenityMy PreCal teacher gave us this problem today. I have worked on it for a very long time and have goten no where. I was wondering if anyone had any ideas. #2 20051215 07:21:48
Re: Proving an IdenityThe title is "Proving an Idenity" so does this mean you are not allowed to use trig identities? As that would be begging the question. "In the real world, this would be a problem. But in mathematics, we can just define a place where this problem doesn't exist. So we'll go ahead and do that now..." #3 20051215 11:47:07
Re: Proving an IdenityYou can use the identities. The words he really used were varifying Trigonometric Idenities. "Proving" that one side equals the other side, or the working of one side to equal the other. #4 20051215 12:24:22
Re: Proving an Idenityhttp://www.pen.k12.va.us/Div/Winchester/jhhs/math/lessons/trig/ident2.html "In the real world, this would be a problem. But in mathematics, we can just define a place where this problem doesn't exist. So we'll go ahead and do that now..." #5 20051215 12:46:42
Re: Proving an Idenitydarn that is great. However he said it could be proven in 45 steps by only working the left side.... Not to be picky, but you wouldn't happen to know how do do it like that? #6 20051215 13:06:49
Re: Proving an IdenityNot a problem. Mostly all you have to do is work backwards: "In the real world, this would be a problem. But in mathematics, we can just define a place where this problem doesn't exist. So we'll go ahead and do that now..." #7 20051215 13:22:21
Re: Proving an IdenityIts funny he has never shown us that formula sinAsinB = 1/2(cos(AB)  cos(A+B)). Is it a given? #9 20051215 13:52:01
Re: Proving an IdenityAre there any "more basic" ways you whould attempt doing it. Or without using that specific formula. IDK what I am asking. Maybe he didn't teach us that because its only a PreCal class. #10 20051215 14:28:45
Re: Proving an IdenityHow would you work it from here? Last edited by harleyd2900 (20051215 14:37:21) 