Re: trig

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not an expert though. taken from my calculator handbook.

rectangular to spherical coordinate conversion
r = sqareroot( x^2 + y^2 + z^2)
angle = tan ^ -1 y/x
ANGLE = tan ^ -1 squareroot(x^2 + y^2)  / z
in picture , angle is the horizontal angle between X and Y axis
ANGLE is the vertical angle off the Z axis
hope this helps.
my search engine gave me these, searching for "math equations"
http://mathforum.org/library/drmath/sets/high_equations.html
www.w3.org/Math
www.math.com

rudy
lotterywars

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