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#1 2013-09-02 08:05:10

mathstudent2000
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trig problems

1. What is the sine of an acute angle whose cosine is 7/25?

2. I'm standing at 300 feet from the base of a very tall building. The building is on a slight hill, so that when I look straight ahead, I am staring at the base of the building. When I look upward at an angle of 54 degrees, I am looking at the top of the building. To the nearest foot, how many feet tall is the building?

3. If A is an acute angle such that \tan A + \sec A = 2, then find \cos A.

4. In triangle GHI, we have GH = HI = 25 and GI = 30. What is \sin\angle GIH?

5. In triangle GHI, we have GH = HI = 25 and GI = 40. What is \sin\angle GHI? (Note: This is NOT the exact same as the previous problem!)


Genius is one percent inspiration and ninety-nine percent perspiration

#2 2013-09-02 08:57:38

bobbym
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Re: trig problems

Hi;


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

#3 2013-09-02 08:59:17

anonimnystefy
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Re: trig problems

Hi







Last edited by anonimnystefy (2013-09-02 09:05:07)


The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

#4 2013-09-02 09:06:17

bobbym
Administrator

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Re: trig problems

Hi;


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

#5 2013-09-02 09:15:15

anonimnystefy
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Re: trig problems

Hi bobbym

My bad! Thought it was GIH again. Your answer is correct for 5!


The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

#6 2013-09-02 09:18:05

bobbym
Administrator

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Re: trig problems

All triangles should be named ABC by law. What if you have a bunch of them? No difference!


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

#7 2013-09-02 09:19:07

anonimnystefy
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Re: trig problems

And, it would make even topologists happy. They already think all triangles are the same!


The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

#8 2013-09-02 09:20:29

bobbym
Administrator

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Re: trig problems

Yea, they are weird.


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

#9 2013-09-02 09:36:40

anonimnystefy
Real Member

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Re: trig problems

Definitely! And there's so many of 'em!


The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

#10 2013-09-02 09:41:19

bobbym
Administrator

Online

Re: trig problems

I think we should consider all topologists the same.


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

#11 2013-09-02 12:26:51

anonimnystefy
Real Member

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Re: trig problems

Unfortunately, that does not reduce their numbers. Only one thing does.


The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment

#12 2013-09-02 13:14:09

bobbym
Administrator

Online

Re: trig problems

Forcing them to computational math would reduce their numbers real quick.


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

#13 2013-09-03 03:48:22

mathstudent2000
Full Member

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Re: trig problems

thanks


Genius is one percent inspiration and ninety-nine percent perspiration

#14 2013-09-03 07:34:13

bobbym
Administrator

Online

Re: trig problems

Hi;

Very good. Did you draw a diagram on that trig problem about the house?


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

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