SOHCAHTOA.
This has to do with triangles. And trig functions. Yeah.
Sin = Opposite/Hypotenuse, y/r
Cos = Adjacent/Hypotenuse, x/r
Tan = Opposite/Adjacent, y/x
The other three are just the opposite of those three.
Csc = Hypotenuse/Opposite, r/y
Sec = Hypotenuse/Adjacent, r/x
Cot = Adjacent/Opposite, x/y
This comes in handy a lot, and it's not hard to remember.
Oh, and I forgot to mention this only works for right triangles.
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