In one of the formulas they seem to be missing a bracket but give an equivalent formula. I figure smart math back ground people will be able to:

1. Determine where the missing bracket goes based on the equivalent formula

2. Determine if the equivalent formula is indeed equivalent

3. Determine if the writer actually knows what they're talking about

Here's the link: http://janmatuschek.de/LatitudeLongitudeBoundingCoordinates#SphereRadius

The missing parenthesis appears be in equation (8):

Δlon = arccos( ( cos(r) - sin(latT) · sin(lat) ) / ( cos(latT) · cos(lat) )

= arcsin(sin(r)/cos(lat)) = 1.1202

= arcsin(sin(r)/cos(lat)) = 1.1202

arccos( ( cos(r) - sin(latT) · sin(lat) ) / ( cos(latT) · cos(lat) )

arcsin(sin(r)/cos(lat))

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Is the following indeed missing a parenthesis? If so where does it go?

arccos( ( cos(r) - sin(latT) · sin(lat) ) / ( cos(latT) · cos(lat) )

TR