25ct wrote:
> You mean "SOHCAHTOA"?  I learnt that at school. I used to be good
> at trig. with a tables book... (still got it),  wish I kept it up...

I still find it easier to picture, at least, using vectorised versions.
e.g.
x = r*COS(t)
y = r*SIN(t)
t = TAN-1(x/y)
r = SQRT((x^2)+(y^2))

-- 
Tim Cook
http://empyrean.scifi-fantasy.com

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