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graphing with phase shift, non-2pi period, amplitude change,  TOPIC_SOLVED

Is there a simple way to graph trig functions that aren't "regular"? Like f(t) = sin(t) is regular, but g(t) = 2sin(3(t-pi/3)) has different amplitude (2 instead of 1), a different period (pi instead of 2pi), and a phase shift (starting at pi/3 instead of at 0). It's complicated!! :shock:
by anonmeans
on Sat Jan 24, 2009 7:24 pm
 
Forum: Trigonometry
Topic: graphing with phase shift, non-2pi period, amplitude change,
Replies: 4
Views: 4975

Re: -1^2: is this equal to -1 or to 1?  TOPIC_SOLVED

For -1^2, the 2 is only on the 1, not the -. If you had (-1)^2, then the 2 would be on the -.
by anonmeans
on Sat Jan 24, 2009 7:26 pm
 
Forum: Pre-Algebra
Topic: -1^2: is this equal to -1 or to 1?
Replies: 7
Views: 5575

Re: What is your favorite math, why, & how do you study for it?

Geometry was okay. Just make a lot of flashcards for the rules. Trig is related, but doesn't feel the same at all!
by anonmeans
on Sat Jan 24, 2009 7:27 pm
 
Forum: Uncategorized
Topic: What is your favorite math, why, & how do you study for it?
Replies: 8
Views: 11878

Re: graphing with phase shift, non-2pi period, amplitude change,  TOPIC_SOLVED

Oh. Thats way easier! But what about for shifting up and down? Do you do the same as you said before, but then redo the t-axis up or down too?
by anonmeans
on Sat Jan 24, 2009 11:03 pm
 
Forum: Trigonometry
Topic: graphing with phase shift, non-2pi period, amplitude change,
Replies: 4
Views: 4975

Law of Cosines: Do I have to learn all three?  TOPIC_SOLVED

My book shows three rules for the Law of Cosines: a 2 = b 2 + c 2 - 2bc cos A b 2 = a 2 + c 2 - 2ac cos B c 2 = a 2 + b 2 - 2ab cos C Don't these all really mean the same thing? "To find (the square of) the length opposite an angle, square the other two sides, and subtract two times the two len...
by anonmeans
on Fri Feb 06, 2009 3:21 pm
 
Forum: Trigonometry
Topic: Law of Cosines: Do I have to learn all three?
Replies: 2
Views: 5709

Re: Law of Cosines: Do I have to learn all three?  TOPIC_SOLVED

Thanks. That's a lot easier. 8-)
by anonmeans
on Mon Feb 09, 2009 6:42 pm
 
Forum: Trigonometry
Topic: Law of Cosines: Do I have to learn all three?
Replies: 2
Views: 5709

Re: Calculate angle through which Roberta swings.  TOPIC_SOLVED

Label half of the angle you need to find as "a". So let APX = a. Then solve cos(a) = 2.3/4 to find a. Multiply by 2 to find the angle you need.

Let me know if that doesn't make sense. 8-)
by anonmeans
on Sat Feb 14, 2009 9:39 pm
 
Forum: Trigonometry
Topic: Calculate angle through which Roberta swings.
Replies: 2
Views: 1977

[SPLIT] question about "pre" tags and leading spaces

This post uses the "pre" tags, but doesn't have trouble with the blank-start lines: The first line that doesn't have a leading "space" doesn't have all the leading spaces removed. Is that because the "pre" section started with text, and it's only the first line that ha...
by anonmeans
on Sat Feb 14, 2009 9:43 pm
 
Forum: Forum Rules & Guides
Topic: [SPLIT] question about "pre" tags and leading spaces
Replies: 1
Views: 2415

Re: if tan(theta) = 1/2, find sin(theta) using trig identities  TOPIC_SOLVED

I don't know what identities you have? The way the other post gave might be as good as any. But if you have to use something else, you could do 1 + tan2(theta) = sec2(theta) = 1/cos2(theta) = 1/{1 - sin2(theta)}, and plug in that 1 + tan2(theta) = 5/4. The answer works out the same.
by anonmeans
on Thu Mar 05, 2009 2:33 pm
 
Forum: Trigonometry
Topic: if tan(theta) = 1/2, find sin(theta) using trig identities
Replies: 4
Views: 23578
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