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!!

- on Sat Jan 24, 2009 7:24 pm
- Forum: Trigonometry
- Topic: graphing with phase shift, non-2pi period, amplitude change,
- Replies:
**4** - Views:
**4932**

For -1^2, the 2 is only on the 1, not the -. If you had (-1)^2, then the 2 would be on the -.

- 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:
**5510**

Geometry was okay. Just make a lot of flashcards for the rules. Trig is related, but doesn't feel the same at all!

- 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:
**11782**

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?

- on Sat Jan 24, 2009 11:03 pm
- Forum: Trigonometry
- Topic: graphing with phase shift, non-2pi period, amplitude change,
- Replies:
**4** - Views:
**4932**

- on Mon Jan 26, 2009 1:27 pm
- Forum: Trigonometry
- Topic: graphing with phase shift, non-2pi period, amplitude change,
- Replies:
**4** - Views:
**4932**

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...

- on Fri Feb 06, 2009 3:21 pm
- Forum: Trigonometry
- Topic: Law of Cosines: Do I have to learn all three?
- Replies:
**2** - Views:
**5680**

Thanks. That's a lot easier.

- on Mon Feb 09, 2009 6:42 pm
- Forum: Trigonometry
- Topic: Law of Cosines: Do I have to learn all three?
- Replies:
**2** - Views:
**5680**

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.

Let me know if that doesn't make sense.

- on Sat Feb 14, 2009 9:39 pm
- Forum: Trigonometry
- Topic: Calculate angle through which Roberta swings.
- Replies:
**2** - Views:
**1919**

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...

- on Sat Feb 14, 2009 9:43 pm
- Forum: Forum Rules & Guides
- Topic: [SPLIT] question about "pre" tags and leading spaces
- Replies:
**1** - Views:
**2395**

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 + tan^{2}(theta) = sec^{2}(theta) = 1/cos^{2}(theta) = 1/{1 - sin^{2}(theta)}, and plug in that 1 + tan^{2}(theta) = 5/4. The answer works out the same.

- 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:
**23192**