Can somebody give me an intuitive understanding of Sine, Cosine, Tangent and perhaps Cotangent, Secant, Cosecant in such a way I won’t forget?

I use them all the time for equations but they might as well be Greek for me. I just want to perfectly understand as much as possible what’s happening when I throw these into the calculator. I haven’t had trigonometry as of yet. via /r/askscience http://ift.tt/1sN6a4E