Hello all,

I was wondering if anybody would be able to explain to me, what sin, cos and tan are. Not how they can be used in trigonometry, but why they are what they are. as in, how did they find these numbers in the first place, what is the difference between them, and well, proving the ideas of cos, sin and tan.

I have been looking online, bu the explanations are confusing. So I have turned to this site, to see if anybody could give me a fairly simple answer.