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Prove without using a calculater that cos36 -cos72 =1/2

1+1 =2 this is true if 1=1

We've been told from Prof.Rafiq that the speed of light is constant only in vacuum and vacuum does not exict. Hence, it is not constant. And the proof was that light is bendable. My question is if light is really bendable, how would this fact proof that speed of light is not constant? And is photons really massless?

Hi People, we have taken today, in chemistry class, wot is called the phase diagram and as we all know that the density of water decreses as it changes to ice. a question came up in my mind...... why is that? why the density of water, and other substances of course, decrases with decresing temperature?? When i asked my teacher this question.... he explaind.... but i didnt understand:embarass: So, if someone can explain that to me please.

Thank u very much for replaying me, Glider, i almost understand it. and let me say it in my words: when we do measurements we get several values, called uncertinity in Measurements. if these values are close to each other we call it precious, but it may not be accurate. and todetermine weather a value is accurate or not we should have or we should be given the true value. and the closer the measured value to the true one, the more accurate it is.

hello everybody.... i got a small problem in understanding the defference between these 2 terms( Precision and Accurancy), in terms of chemistry so, i will be greateful if someone can explain it to me.

What do u think of home schooling or or home tuition? is it really better than mainstream setting such as public or private school?What do u think?? ((supporting or upposing??)) I definetly aginst this idea. My major reason is that the pupils will teeribly isolated from their peers and society

I don't know yet weather the book is in our our university's library or not because the system, unfortonately, is still broken-down

Topic: Mandatory volunteering should not be prohibited. What do u think of mandatory volunteering and its effect on students in school. Do u with or against it and why?

Thank u. i am looking for more scientific things.

there is no harm if u can help me also to find books about these waepons,design and the way it works, in special. Thanx

as i post in the previous letter and thank u for ur quick resond

Hello everybody Can u do me a small favour. I'm from Oman and I am studing in college of engineering and I am now taking the intesive English program, primary level , currently .I'd like u, if possible, to give me some websites about nuclear weapons because I am gonna do a project about these wapons. . I am looking for the, especially for THE DESIGN & HOW IT WORK. i will be very greateful if u provide me with my application. i am looking forward for ur responds. Thank u