Science & Mathematics - 22 November 2007

you can answer all or one
please write out all the steps taken :-)

#1 (sin^3+cos^3)/(1-2cos^2)=
(sec-sin)/(tan-1)

#2 (tanA+tanB)(1-cotAcotB)+
(cotA+cotB)(1-tanAtanB)=0

#3 cos((3pi/2)+angle)=sin angle

#4( cos(A+B))/(cos(A-B))=
(1-tanAtanB)/(1+tanAtanB)

#5 sec(A-B)= (secAsecB)/(1+tanAtanB)

#6 (cos(A-B))(cos(A+B))= ((cos^2)A)-((sin^2)B)

A= alpha B=beta
thank you :-)

2007-11-22 07:43:28 · 2 answers · asked by Alina Z 2 in Mathematics

2007-11-22 07:36:09 · 2 answers · asked by Brie 3 in Geography

(5/4)x^2 + (1/2)x -22 = 0
x[(5/4)x + 1/2] =0
x=?

2007-11-22 07:34:26 · 6 answers · asked by RogerDodger 1 in Mathematics

Hi there

Was wondering if anyone knows a site or page that has definitions for the meanings of terms like fossa , anastomosis , costal facet .

I know some of the basic ones like coronary which means a crown or circle.

I will appreciate anything shown as it will help in my anatomy revision and make things a bit more clearer for me.

Thankyou!

2007-11-22 07:30:16 · 6 answers · asked by Anonymous in Medicine

This is a follow-up to a question I answered. I was taught that the "contiguous United States" is the lower 48, and that the "continental Unites States" should be considered to include Alaska (once Alaska, also on the North American continent, became a state). Another person who answered the same question strongly disagreed, but said the two expressions are synonymous. Makes no sense to me, but it would be nice to find out what others were taught on this.

2007-11-22 07:29:25 · 13 answers · asked by mountain lady 3 in Geography

I read a news article that said some scientists think it could be:
http://english.pravda.ru/science/tech/01-09-2006/84194-moon-0

I'm just wondering if anyone else has any scholarly websites that might give a decent (and unbiased) discussion about this topic.

2007-11-22 07:29:06 · 6 answers · asked by MumOf5 6 in Astronomy & Space

thank you!! :)

2007-11-22 07:28:11 · 6 answers · asked by a89411389 1 in Mathematics

This is a new problem to me, I have never encountered a problem with the "4th power".

12x^4-31x^2+20=0

Plz explain step by step!

2007-11-22 07:25:23 · 7 answers · asked by CLUELESS! 1 in Mathematics

how exactly we are moving on planet earth...
Like thinking of the approximate angle of earths axis, it's rotation speed, our position regarding the sun....
Our position regarding the galaxy......

And perhaps just thinking-why bother with our daily affairs?
I'm happy as it is, this cosmic reality is here for us to enjoy....
It's like we're allready in heaven?


Like, everyone has an idea of our position, but does anyone actually REALISE what it represents?
To think that if you could sleep for a billion years, you'd wake up to the same scenario....nothing would have moved......?!

2007-11-22 07:19:36 · 10 answers · asked by Anonymous in Astronomy & Space

I need help.im in 9th grade and i need to do a research project that has to be pretty advanced.right now im going to do an experiment where im take nails comparing them to see which one rust fast like,one will be a regualr steel one,one will be painted,one will be galvanized and there will two nails used together as cathode protection.how can i make it better?i need answeres asap,please!!!!!!!!!!!!!!!!!!!!!!!!
16 hours ago - 3 days left to answer.

2007-11-22 07:18:17 · 2 answers · asked by Speeding D 4 in Engineering

Please seriously you've gotta help me!!! )': pleeeaaasse?

2007-11-22 07:17:18 · 16 answers · asked by ♥ஜღAubreyღஜ♥ 2 in Mathematics

i^2006

it is :
i to the 2006th power....!

i thought it was -2006 but its not! what is it then..?hm?

2007-11-22 07:15:06 · 4 answers · asked by CLUELESS! 1 in Mathematics

If you are the parent of a lactose intolerant baby, describe why, in chemical terms, why you would have to carefully identify the substances in a can of baby formula before you feed it to your baby?

2007-11-22 07:14:12 · 2 answers · asked by Jada 1 in Chemistry

I know two negatively charged ions (non-metals) can react and form a compound, but can two positively charged ions (metals/metalloids) do the same?

2007-11-22 07:05:46 · 2 answers · asked by black_star_47001 3 in Chemistry

2007-11-22 07:03:12 · 1 answers · asked by Anonymous in Chemistry

i have an invention but cant find an engineer to design and build, who wont steal my idea

2007-11-22 07:01:06 · 4 answers · asked by vivid 1 in Engineering

2007-11-22 07:00:35 · 20 answers · asked by MR.SNOOPS 3 in Astronomy & Space

About the year 2000, before they sent two probes to Mars, there was a website where you could register you name to be included on a disc that was attached to the probe which would later be sent to Mars. There was also a way to download a certificate to affirm that your name had been included on the Marsbound disc, but I did not at that time download mine or my friends names that I entered. Does anyone know anything about this site ? Is it still active and could I still find it to download these certificates or is the website now closed ? Thanks.

2007-11-22 06:58:13 · 2 answers · asked by birdman 2 in Astronomy & Space

2007-11-22 06:49:20 · 7 answers · asked by glseme 1 in Astronomy & Space

nothing

2007-11-22 06:48:47 · 9 answers · asked by alu 1 in Astronomy & Space

2007-11-22 06:45:12 · 9 answers · asked by Deborah J 1 in Mathematics

millions would get drowned?

2007-11-22 06:40:17 · 3 answers · asked by Anonymous in Earth Sciences & Geology

2007-11-22 06:39:33 · 4 answers · asked by homeboy187nic 2 in Mathematics

A student prepares a solution by dissolving 3.72 g of NaOH in enough water to make 300. mL of solution.
The student then transfers 32.0 mL of this solution into a 100. mL volumetric flask. Water is then added
up to the 100. mL mark.
What is the final molarity of NaOH in the 100. mL flask ?

2007-11-22 06:37:01 · 3 answers · asked by jetschic28 1 in Chemistry

2007-11-22 06:36:37 · 2 answers · asked by rodger s 1 in Zoology

And why did Yahoo Answers want to put this in weddings????????????

2007-11-22 06:34:54 · 22 answers · asked by insomnia c 4 in Astronomy & Space

2007-11-22 06:30:21 · 3 answers · asked by Anonymous in Mathematics

Antimatter of course has extremely useful practical applications, but what about neutron star matter? If we could safely construct large amounts of such matter, what could we use it for? (Antimatter has been created at CERN and other particle accelerators in minute amounts, of course, but as far as I know no one has created anything like neutron star matter.)

2007-11-22 06:28:09 · 7 answers · asked by Anonymous in Astronomy & Space

Is it possible to send the spaceship entirely working over solar energy?

2007-11-22 06:28:06 · 5 answers · asked by i 2 in Astronomy & Space

we did an experiment on metal reactivities . the reactions was between three metals copper. magnesium and zinc and with three solutions copper, magnesum and zinc

what caused the formation of the color in the test tube during the reaction? please explain

2007-11-22 06:27:41 · 2 answers · asked by Anonymous in Chemistry