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#1 2009-01-04 04:28:34

careless25
Real Member
Registered: 2008-07-24
Posts: 560

Math help

I recently moved to USA from Canada and my education is a bit of a mess right now. I am behind is some of the math that is being taught and there are some holes in my knowledge and i need help with filling those up.

1.Can some one explain what sin/tan/cos theta are?
2.What csc/cot/sec are?
3. How do they help me with triangles?
4. any other things related to them.

Thx for your help,

C25

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#2 2009-01-04 12:14:33

JaneFairfax
Member
Registered: 2007-02-23
Posts: 6,868

Re: Math help

Consider this right-angled triange.

01001.png

They hypotenuse the side opposite the right angle. The other two sides are called adjacent (next to the angle x) and opposite (opposite the angle x).

Then we have

1.

2.

3.
They help you calculate unknown sides and angles of triangles.

4.
There are lots of useful trigonometrical formulas, such as

(note that we usually write
as
; similarly for the other trigonometric functions).

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#3 2009-01-05 00:14:31

ganesh
Administrator
Registered: 2005-06-28
Posts: 34,562

Re: Math help

careless25,
Please check these formulas, particularly post #7.
The other posts maybe useful too, a little later. smile


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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#4 2009-01-06 09:57:33

careless25
Real Member
Registered: 2008-07-24
Posts: 560

Re: Math help

isn't that the same as saying sin/cos/tan ^-1?
post #7?what

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#5 2009-01-06 10:28:28

lightning
Real Member
Registered: 2007-02-26
Posts: 2,060

Re: Math help

um in maths i remember a poster that had sin on it. i think is the bottom tiangle line. i will check on thursday because i don't hae maths on a wed big_smile


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