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 Posted: Sat Sep 01, 2012 8:30 pm
No worries. =] Let's see. So, you know SOH CAH TOA? I write it down every time I get a question involving trig functions. Sin = opp/hypotenuse. Cosin = adj/hypotenuse. Tan = opp/adj. And Arc in front of one of the functions just means inverse of that trig function. Sin^-1 is the same as saying arcsin btw. EX: Tan(Arcsin 3/5) Always start inside ( ). I would use the Arcsin to find Opp, Adj, and Hyp. Arcsin 3/5 = theta which means Sin theta equal 3/5 which means 3 is opp and 5 is hyp. So use Pythagorus to find the adj is 4. So tan is 3/4 I'm a little rusty on Trig functions so here's a more link that might be able to explain it better than me. http://www.freemathhelp.com/forum/threads/59529-tan(arcsin(5-13))-calculated-without-a-calculator-how
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Posted: Sun Sep 09, 2012 5:54 pm
Malacina No worries. =] Let's see. So, you know SOH CAH TOA? I write it down every time I get a question involving trig functions. Sin = opp/hypotenuse. Cosin = adj/hypotenuse. Tan = opp/adj. And Arc in front of one of the functions just means inverse of that trig function. Sin^-1 is the same as saying arcsin btw. EX: Tan(Arcsin 3/5) Always start inside ( ). I would use the Arcsin to find Opp, Adj, and Hyp. Arcsin 3/5 = theta which means Sin theta equal 3/5 which means 3 is opp and 5 is hyp. So use Pythagorus to find the adj is 4. So tan is 3/4 I'm a little rusty on Trig functions so here's a more link that might be able to explain it better than me. http://www.freemathhelp.com/forum/threads/59529-tan(arcsin(5-13))-calculated-without-a-calculator-how WOW. I'm really sorry I didn't see this earlier. :c It wasn't saying someone posted/replied. Thanks for the help, I tried the problem and hopefully my teacher grades it soon. :3 Could you help me with stuff like this? http://i49.tinypic.com/72rrc8.jpg Or, I guess for the second one I'm just wondering if sin a and cos a is the same as cos 0 and sin 0(or not 0.. but the zero with a line in it) Because in the lesson recording, legit, the only things covered were these slides was this. haha :c I don't get pre-calc and to make it worse my teacher doesn't try to help. http://i49.tinypic.com/25r1d3c.jpg
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Posted: Sun Sep 09, 2012 7:30 pm
Don't worry about it, mine didn't use to tell me about updates either. I don't know why it started to, either. Haha. xd I don't mind helping. So, first off, a 0 with a line through it is called a theta. Theta is angle measurement of the triangle which could also be labeled as A, B, or C to distinguished one angle from another. When it asks for Sin A and Cos A it just wants the side measurement (use SOH CAH TOA) and then to simplify it. For the first one, Webpage TitleYou'll use SOH CAH TOA a lot. Or at least, I always did. Does any of that make sense when I explain it? It's a bit hard to write this in a way it makes sense. And is that second link the Unit Circle? I couldn't really see it.
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Posted: Sun Sep 09, 2012 8:11 pm
Malacina Don't worry about it, mine didn't use to tell me about updates either. I don't know why it started to, either. Haha. xd I don't mind helping. So, first off, a 0 with a line through it is called a theta. Theta is angle measurement of the triangle which could also be labeled as A, B, or C to distinguished one angle from another. When it asks for Sin A and Cos A it just wants the side measurement (use SOH CAH TOA) and then to simplify it. For the first one, Webpage TitleYou'll use SOH CAH TOA a lot. Or at least, I always did. Does any of that make sense when I explain it? It's a bit hard to write this in a way it makes sense. And is that second link the Unit Circle? I couldn't really see it. Yeah. The google docs link isn't working, it says it isn't shared. But, could you give an example of the one with the answer choices? I chose the third one because I was thinking that it was opp/hyp then adj/hyp which came to those answers. So I don't understand why that was wrong since in my notes that what it said. I was wondering if since it has Sin/cos A instead of sin/cos theta does that change anything?
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Posted: Sun Sep 09, 2012 11:13 pm
Immoral Oblivion Malacina Don't worry about it, mine didn't use to tell me about updates either. I don't know why it started to, either. Haha. xd I don't mind helping. So, first off, a 0 with a line through it is called a theta. Theta is angle measurement of the triangle which could also be labeled as A, B, or C to distinguished one angle from another. When it asks for Sin A and Cos A it just wants the side measurement (use SOH CAH TOA) and then to simplify it. For the first one, Webpage TitleYou'll use SOH CAH TOA a lot. Or at least, I always did. Does any of that make sense when I explain it? It's a bit hard to write this in a way it makes sense. And is that second link the Unit Circle? I couldn't really see it. Yeah. The google docs link isn't working, it says it isn't shared. But, could you give an example of the one with the answer choices? I chose the third one because I was thinking that it was opp/hyp then adj/hyp which came to those answers. So I don't understand why that was wrong since in my notes that what it said. I was wondering if since it has Sin/cos A instead of sin/cos theta does that change anything? Sorry, forgot to share it. Try it now. Webpage Title The doc is an example of the first question up there. Let me try and explain though. You're notes are right, don't worry. Um, no, changing theta to A doesn't change what you do, but it does change where you look. Since A is the top angle, you'll use that as your reference point when finding your adj and opp seeing as your hyp doesn't change. Angle A is the top angle, making the shorter side your adjacent side and the long side your opposite. It's flipped if you use the lower angle which what you're probably use to seeing. Also if you want, since this doesn't always tell you I posted, you can PM about anything, as well.
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Posted: Sun Oct 14, 2012 4:05 pm
I have a question:
Choice #1: Describe each of the following properties of the graph of the Cosine Function, f(theta) = cos(theta) and relate the property to the unit circle definition of cosine.
Amplitude
Period
Domain
Range
x-intercepts
Choice #2: Describe each of the following properties of the graph of the Sine Function, f(theta) = sin(theta) and relate the property to the unit circle definition of sine.
Amplitude
Period
Domain
Range
x-intercepts
I don't need the answer, I just don't understand what they mean by Cosine Function, f(theta) = cos(theta) and Sine Function, f(theta) = sin(theta).
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