Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

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

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

Consider this right-angled triange.

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

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**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 34,570

careless25,

Please check these formulas, particularly post #7.

The other posts maybe useful too, a little later.

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

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

post #7?

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

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

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