Imaginary Definition and 362 Threads

No one answered my burning questions about imaginary tides...these tides that have me in a bind, so to speak. So, *sniff, sniff* I will just blunder through the essay questions as best I can. Thanking everyone who has helped me all these weeks...I have a test Monday and feel confident...

Question: Use the formula cos(x + iy) = cos(x)cos(iy) - sin(x)sin(iy) to find two imaginary numbers whose cosine is 3 My workings so far: cos(x)cos(iy) - sin(x)sin(iy) = 3 Therefore: cos(x)cosh(y) - i(sin(x)sinh(y)) = 3 cos(x)cosh(y) = 3 sin(x)sinh(y) = 0 sin(x) = 0 x = 0...

I was just wondering if anyone knows the rule when taking the derivative of an imaginary number(i). For example: d(ix)/dx=? Thanks:)

z1 = x + iy z2 = x - iy (Complex conjugate) Find: Im (1/z1) This is what I have tried to do: (1) z1*z2 = x^2 + y^2 (2) z2 / (x^2 + y^2) = 1 / z1 The answer is: -y / (x^2 + y^2) = I am (1 / z1) So my question is: Can I change z2 to I am (z2) and z1 to I am (z1) in...

Just found this link in another forum I participate in. Just hilarious what people are willing to do to make a few bucks. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2964350069&category=45208 I pretty sure some lonely physics or chem guy in here can use the service. :wink:

Greetings. I am having problems understanding some things about shells. Actually, i am not even sure of if i am talking about shells (i am not sure this is the term in English, but i think it is). I have been taught that a shell is a place of space round the nuclei with a highest probability...

Bonjour, Je suis nouveau à ce forum. :-) I am a newbie in this forum.. My question concerns the imaginary part in the relativistic distance. Is someone has some physical interpretations? Why should this sqrt(-1) exist in this equation? Not the mathematical explanation :-( but the physical...

this is a concept which i don't believe has been properly described to me and i really don't understand well enough. can someone discribe it to me in relitivly simple terms.

Via conversation, stereotype and simple-daydreaming I have found out that there are States in America which I and others imagine to be dull, lifeless, the pits of the earth. Whether this is the real state of affairs in these states doesn't seem to matter. Some states like California and New York...

Could someone PULEEZ explain how to work the following equation: 3-7i/2+3i For the life of me I cannot sqeeze this into my brain! Thank you in advance.

I have an Algebra problem giving me trouble. I am supposed to determine without graphing, if the following equation is symetrical to the x or y-axis or to the origin. The equation is y^2 = -5/x^2. The problem is, I think that this is an imaginary number. Am I right about that?

What are imaginary numbers and how and why are they used in physics? Please could you try and make your answers as simple as possible and bear in mind that I have not even finished my GCSE course in maths yet.